87661031 has 8 divisors (see below), whose sum is σ = 89604144. Its totient is φ = 85739200.

The previous prime is 87661019. The next prime is 87661033. The reversal of 87661031 is 13016678.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87661031 - 2⁶ = 87660967 is a prime.

It is a super-2 number, since 2×87661031² = 15368912711965922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87661033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3155 + ... + 13611.

It is an arithmetic number, because the mean of its divisors is an integer number (11200518).

Almost surely, 2^87661031 is an apocalyptic number.

87661031 is a deficient number, since it is larger than the sum of its proper divisors (1943113).

87661031 is a wasteful number, since it uses less digits than its factorization.

87661031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10641.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 87661031 is about 9362.7469793859. The cubic root of 87661031 is about 444.2241769619.

The spelling of 87661031 in words is "eighty-seven million, six hundred sixty-one thousand, thirty-one".