987879481 has 2 divisors, whose sum is σ = 987879482. Its totient is φ = 987879480.

The previous prime is 987879479. The next prime is 987879491. The reversal of 987879481 is 184978789.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 856089081 + 131790400 = 29259^2 + 11480^2 .

It is an emirp because it is prime and its reverse (184978789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987879481 - 2¹ = 987879479 is a prime.

It is a super-2 number, since 2×987879481² = 1951811737961658722, which contains 22 as substring.

Together with 987879479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (987879491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493939740 + 493939741.

It is an arithmetic number, because the mean of its divisors is an integer number (493939741).

Almost surely, 2^987879481 is an apocalyptic number.

It is an amenable number.

987879481 is a deficient number, since it is larger than the sum of its proper divisors (1).

987879481 is an equidigital number, since it uses as much as digits as its factorization.

987879481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8128512, while the sum is 61.

The square root of 987879481 is about 31430.5501224525. The cubic root of 987879481 is about 995.9433931931.

The spelling of 987879481 in words is "nine hundred eighty-seven million, eight hundred seventy-nine thousand, four hundred eighty-one".