87157911 has 4 divisors (see below), whose sum is σ = 116210552. Its totient is φ = 58105272.

The previous prime is 87157909. The next prime is 87157913. The reversal of 87157911 is 11975178.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (87157909) and next prime (87157913).

It is not a de Polignac number, because 87157911 - 2¹ = 87157909 is a prime.

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 87157911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87157913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14526316 + ... + 14526321.

It is an arithmetic number, because the mean of its divisors is an integer number (29052638).

Almost surely, 2^87157911 is an apocalyptic number.

87157911 is a deficient number, since it is larger than the sum of its proper divisors (29052641).

87157911 is a wasteful number, since it uses less digits than its factorization.

87157911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29052640.

The product of its digits is 17640, while the sum is 39.

The square root of 87157911 is about 9335.8401335927. The cubic root of 87157911 is about 443.3726887004.

The spelling of 87157911 in words is "eighty-seven million, one hundred fifty-seven thousand, nine hundred eleven".