91051573104 has 180 divisors, whose sum is σ = 268049456584. Its totient is φ = 28848897792.

The previous prime is 91051573091. The next prime is 91051573117. The reversal of 91051573104 is 40137515019.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91051573091) and next prime (91051573117).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12413022 + ... + 12420354.

Almost surely, 2^91051573104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91051573104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134024728292).

91051573104 is an abundant number, since it is smaller than the sum of its proper divisors (176997883480).

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

91051573104 is a wasteful number, since it uses less digits than its factorization.

91051573104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7556 (or 7524 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The spelling of 91051573104 in words is "ninety-one billion, fifty-one million, five hundred seventy-three thousand, one hundred four".