87831081331 has 4 divisors (see below), whose sum is σ = 100378378672. Its totient is φ = 75283783992.

The previous prime is 87831081313. The next prime is 87831081343. The reversal of 87831081331 is 13318013878.

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 87831081331 - 2³¹ = 85683597683 is a prime.

It is a super-2 number, since 2×87831081331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87831031331) 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, 6273648660 + ... + 6273648673.

It is an arithmetic number, because the mean of its divisors is an integer number (25094594668).

Almost surely, 2^87831081331 is an apocalyptic number.

87831081331 is a deficient number, since it is larger than the sum of its proper divisors (12547297341).

87831081331 is a wasteful number, since it uses less digits than its factorization.

87831081331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12547297340.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 87831081331 in words is "eighty-seven billion, eight hundred thirty-one million, eighty-one thousand, three hundred thirty-one".