91477407109 has 6 divisors (see below), whose sum is σ = 100549546790. Its totient is φ = 83161279080.

The previous prime is 91477407079. The next prime is 91477407127. The reversal of 91477407109 is 90170477419.

It can be written as a sum of positive squares in only one way, i.e., 84985076484 + 6492330625 = 291522^2 + 80575^2 .

It is not a de Polignac number, because 91477407109 - 2⁷ = 91477406981 is a prime.

It is a super-2 number, since 2×91477407109² (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 (91477407139) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 378005694 + ... + 378005935.

Almost surely, 2^91477407109 is an apocalyptic number.

It is an amenable number.

91477407109 is a deficient number, since it is larger than the sum of its proper divisors (9072139681).

91477407109 is a wasteful number, since it uses less digits than its factorization.

91477407109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756011651 (or 756011640 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 49.

The spelling of 91477407109 in words is "ninety-one billion, four hundred seventy-seven million, four hundred seven thousand, one hundred nine".