87745531 has 4 divisors (see below), whose sum is σ = 90576064. Its totient is φ = 84915000.

The previous prime is 87745523. The next prime is 87745547. The reversal of 87745531 is 13554778.

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

It is a cyclic number.

It is not a de Polignac number, because 87745531 - 2³ = 87745523 is a prime.

It is a super-2 number, since 2×87745531² = 15398556420943922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87745501) 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, 1415220 + ... + 1415281.

It is an arithmetic number, because the mean of its divisors is an integer number (22644016).

Almost surely, 2^87745531 is an apocalyptic number.

87745531 is a deficient number, since it is larger than the sum of its proper divisors (2830533).

87745531 is a wasteful number, since it uses less digits than its factorization.

87745531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830532.

The product of its digits is 117600, while the sum is 40.

The square root of 87745531 is about 9367.2584569873. The cubic root of 87745531 is about 444.3668663183.

The spelling of 87745531 in words is "eighty-seven million, seven hundred forty-five thousand, five hundred thirty-one".