91131331401 has 48 divisors (see below), whose sum is σ = 153055363968. Its totient is φ = 51637824000.

The previous prime is 91131331393. The next prime is 91131331429. The reversal of 91131331401 is 10413313119.

It is a happy number.

It is not a de Polignac number, because 91131331401 - 2³ = 91131331393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91131331451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74835 + ... + 433431.

It is an arithmetic number, because the mean of its divisors is an integer number (3188653416).

Almost surely, 2^91131331401 is an apocalyptic number.

It is an amenable number.

91131331401 is a deficient number, since it is larger than the sum of its proper divisors (61924032567).

91131331401 is a wasteful number, since it uses less digits than its factorization.

91131331401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358782 (or 358779 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 91131331401 in words is "ninety-one billion, one hundred thirty-one million, three hundred thirty-one thousand, four hundred one".