91409371216 has 10 divisors (see below), whose sum is σ = 177105656762. Its totient is φ = 45704685600.

The previous prime is 91409371213. The next prime is 91409371289. The reversal of 91409371216 is 61217390419.

It can be written as a sum of positive squares in only one way, i.e., 55196803600 + 36212567616 = 234940^2 + 190296^2 .

It is a super-2 number, since 2×91409371216² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91409371211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2856542835 + ... + 2856542866.

Almost surely, 2^91409371216 is an apocalyptic number.

It is an amenable number.

91409371216 is a deficient number, since it is larger than the sum of its proper divisors (85696285546).

91409371216 is a wasteful number, since it uses less digits than its factorization.

91409371216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5713085709 (or 5713085703 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 91409371216 in words is "ninety-one billion, four hundred nine million, three hundred seventy-one thousand, two hundred sixteen".