87001131231 has 24 divisors (see below), whose sum is σ = 145015303680. Its totient is φ = 49232259216.

The previous prime is 87001131223. The next prime is 87001131257. The reversal of 87001131231 is 13213110078.

It is a happy number.

It is not a de Polignac number, because 87001131231 - 2³ = 87001131223 is a prime.

It is a super-2 number, since 2×87001131231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87001131195 and 87001131204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87001131431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6697251 + ... + 6710228.

It is an arithmetic number, because the mean of its divisors is an integer number (6042304320).

Almost surely, 2^87001131231 is an apocalyptic number.

87001131231 is a deficient number, since it is larger than the sum of its proper divisors (58014172449).

87001131231 is a wasteful number, since it uses less digits than its factorization.

87001131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13407595 (or 13407592 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The spelling of 87001131231 in words is "eighty-seven billion, one million, one hundred thirty-one thousand, two hundred thirty-one".