91355632251 has 8 divisors (see below), whose sum is σ = 131177318160. Its totient is φ = 56218850592.

The previous prime is 91355632243. The next prime is 91355632261. The reversal of 91355632251 is 15223655319.

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

It is not a de Polignac number, because 91355632251 - 2³ = 91355632243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91355632201) 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, 1171226016 + ... + 1171226093.

It is an arithmetic number, because the mean of its divisors is an integer number (16397164770).

Almost surely, 2^91355632251 is an apocalyptic number.

91355632251 is a deficient number, since it is larger than the sum of its proper divisors (39821685909).

91355632251 is a wasteful number, since it uses less digits than its factorization.

91355632251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2342452125.

The product of its digits is 243000, while the sum is 42.

The spelling of 91355632251 in words is "ninety-one billion, three hundred fifty-five million, six hundred thirty-two thousand, two hundred fifty-one".