987542879797 has 4 divisors (see below), whose sum is σ = 987555202380. Its totient is φ = 987530557216.

The previous prime is 987542879773. The next prime is 987542879821. The reversal of 987542879797 is 797978245789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 797978245789 = 43 ⋅18557633623.

It is an interprime number because it is at equal distance from previous prime (987542879773) and next prime (987542879821).

It can be written as a sum of positive squares in 2 ways, for example, as 412563420721 + 574979459076 = 642311^2 + 758274^2 .

It is a cyclic number.

It is not a de Polignac number, because 987542879797 - 2¹⁹ = 987542355509 is a prime.

It is a super-2 number, since 2×987542879797² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 987542879797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987542879497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6040288 + ... + 6201625.

It is an arithmetic number, because the mean of its divisors is an integer number (246888800595).

Almost surely, 2^987542879797 is an apocalyptic number.

It is an amenable number.

987542879797 is a deficient number, since it is larger than the sum of its proper divisors (12322583).

987542879797 is a wasteful number, since it uses less digits than its factorization.

987542879797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12322582.

The product of its digits is 4480842240, while the sum is 82.

The spelling of 987542879797 in words is "nine hundred eighty-seven billion, five hundred forty-two million, eight hundred seventy-nine thousand, seven hundred ninety-seven".