91087087431 has 8 divisors (see below), whose sum is σ = 121591167984. Its totient is φ = 60653865920.

The previous prime is 91087087411. The next prime is 91087087489. The reversal of 91087087431 is 13478078019.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91087087431 is a prime.

It is a super-2 number, since 2×91087087431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91087087411) 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, 17711760 + ... + 17716901.

It is an arithmetic number, because the mean of its divisors is an integer number (15198895998).

Almost surely, 2^91087087431 is an apocalyptic number.

91087087431 is a deficient number, since it is larger than the sum of its proper divisors (30504080553).

91087087431 is a wasteful number, since it uses less digits than its factorization.

91087087431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35429521.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 91087087431 in words is "ninety-one billion, eighty-seven million, eighty-seven thousand, four hundred thirty-one".