91178917053 has 128 divisors (see below), whose sum is σ = 153500958720. Its totient is φ = 46969528320.

The previous prime is 91178917051. The next prime is 91178917103. The reversal of 91178917053 is 35071987119.

It is not a de Polignac number, because 91178917053 - 2¹ = 91178917051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 91178916987 and 91178917005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91178917051) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 137940543 + ... + 137941203.

It is an arithmetic number, because the mean of its divisors is an integer number (1199226240).

Almost surely, 2^91178917053 is an apocalyptic number.

It is an amenable number.

91178917053 is a deficient number, since it is larger than the sum of its proper divisors (62322041667).

91178917053 is a wasteful number, since it uses less digits than its factorization.

91178917053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907.

The product of its (nonzero) digits is 476280, while the sum is 51.

The spelling of 91178917053 in words is "ninety-one billion, one hundred seventy-eight million, nine hundred seventeen thousand, fifty-three".