91279720441 has 24 divisors (see below), whose sum is σ = 116605515264. Its totient is φ = 69891569280.

The previous prime is 91279720391. The next prime is 91279720453. The reversal of 91279720441 is 14402797219.

It is a happy number.

It is not a de Polignac number, because 91279720441 - 2⁹ = 91279719929 is a prime.

It is a super-2 number, since 2×91279720441² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 91279720391 and 91279720400.

It is not an unprimeable number, because it can be changed into a prime (91279720241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1207836 + ... + 1281181.

It is an arithmetic number, because the mean of its divisors is an integer number (4858563136).

Almost surely, 2^91279720441 is an apocalyptic number.

91279720441 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

91279720441 is a deficient number, since it is larger than the sum of its proper divisors (25325794823).

91279720441 is a wasteful number, since it uses less digits than its factorization.

91279720441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489081 (or 2489068 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 91279720441 in words is "ninety-one billion, two hundred seventy-nine million, seven hundred twenty thousand, four hundred forty-one".