91937149251 has 32 divisors (see below), whose sum is σ = 138271069440. Its totient is φ = 53991465984.

The previous prime is 91937149207. The next prime is 91937149259. The reversal of 91937149251 is 15294173919.

It is not a de Polignac number, because 91937149251 - 2¹⁷ = 91937018179 is a prime.

It is a super-2 number, since 2×91937149251² (a number of 23 digits) contains 22 as substring.

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 = 91937149194 and 91937149203.

It is not an unprimeable number, because it can be changed into a prime (91937149259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 491130 + ... + 651983.

It is an arithmetic number, because the mean of its divisors is an integer number (4320970920).

Almost surely, 2^91937149251 is an apocalyptic number.

91937149251 is a deficient number, since it is larger than the sum of its proper divisors (46333920189).

91937149251 is a wasteful number, since it uses less digits than its factorization.

91937149251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143235.

The product of its digits is 612360, while the sum is 51.

The spelling of 91937149251 in words is "ninety-one billion, nine hundred thirty-seven million, one hundred forty-nine thousand, two hundred fifty-one".