87162509 has 4 divisors (see below), whose sum is σ = 99614304. Its totient is φ = 74710716.

The previous prime is 87162503. The next prime is 87162601. The reversal of 87162509 is 90526178.

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 87162509 - 2²⁰ = 86113933 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 (87162503) 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, 6225887 + ... + 6225900.

It is an arithmetic number, because the mean of its divisors is an integer number (24903576).

Almost surely, 2^87162509 is an apocalyptic number.

It is an amenable number.

87162509 is a deficient number, since it is larger than the sum of its proper divisors (12451795).

87162509 is a wasteful number, since it uses less digits than its factorization.

87162509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12451794.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 87162509 is about 9336.0863856329. The cubic root of 87162509 is about 443.3804852456.

The spelling of 87162509 in words is "eighty-seven million, one hundred sixty-two thousand, five hundred nine".