87311151997 has 4 divisors (see below), whose sum is σ = 87314174656. Its totient is φ = 87308129340.

The previous prime is 87311151929. The next prime is 87311152003. The reversal of 87311151997 is 79915111378.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87311151997 - 2⁷ = 87311151869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87311251997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1467579 + ... + 1525912.

It is an arithmetic number, because the mean of its divisors is an integer number (21828543664).

Almost surely, 2^87311151997 is an apocalyptic number.

It is an amenable number.

87311151997 is a deficient number, since it is larger than the sum of its proper divisors (3022659).

87311151997 is a wasteful number, since it uses less digits than its factorization.

87311151997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022658.

The product of its digits is 476280, while the sum is 52.

The spelling of 87311151997 in words is "eighty-seven billion, three hundred eleven million, one hundred fifty-one thousand, nine hundred ninety-seven".