91251075552 has 144 divisors (see below), whose sum is σ = 300075853392. Its totient is φ = 24066201600.

The previous prime is 91251075547. The next prime is 91251075569. The reversal of 91251075552 is 25557015219.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 684949 + ... + 807252.

It is an arithmetic number, because the mean of its divisors is an integer number (2083860093).

Almost surely, 2^91251075552 is an apocalyptic number.

It is an amenable number.

91251075552 is an abundant number, since it is smaller than the sum of its proper divisors (208824777840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91251075552 is a wasteful number, since it uses less digits than its factorization.

91251075552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492241 (or 1492226 counting only the distinct ones).

The product of its (nonzero) digits is 157500, while the sum is 42.

The spelling of 91251075552 in words is "ninety-one billion, two hundred fifty-one million, seventy-five thousand, five hundred fifty-two".