87100531 has 4 divisors (see below), whose sum is σ = 99543472. Its totient is φ = 74657592.

The previous prime is 87100529. The next prime is 87100547. The reversal of 87100531 is 13500178.

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 87100531 - 2¹ = 87100529 is a prime.

It is a super-2 number, since 2×87100531² = 15173005000963922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87100496 and 87100505.

It is not an unprimeable number, because it can be changed into a prime (87100501) 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, 6221460 + ... + 6221473.

It is an arithmetic number, because the mean of its divisors is an integer number (24885868).

Almost surely, 2^87100531 is an apocalyptic number.

87100531 is a deficient number, since it is larger than the sum of its proper divisors (12442941).

87100531 is a wasteful number, since it uses less digits than its factorization.

87100531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12442940.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 87100531 is about 9332.7665244557. The cubic root of 87100531 is about 443.2753699007.

The spelling of 87100531 in words is "eighty-seven million, one hundred thousand, five hundred thirty-one".