91374904981 has 8 divisors (see below), whose sum is σ = 91445361624. Its totient is φ = 91304478720.

The previous prime is 91374904969. The next prime is 91374904991. The reversal of 91374904981 is 18940947319.

It can be written as a sum of positive squares in 4 ways, for example, as 25621124356 + 65753780625 = 160066^2 + 256425^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91374904981 - 2⁷ = 91374904853 is a prime.

It is a super-2 number, since 2×91374904981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91374904961) 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 7 ways as a sum of consecutive naturals, for example, 13206735 + ... + 13213651.

It is an arithmetic number, because the mean of its divisors is an integer number (11430670203).

Almost surely, 2^91374904981 is an apocalyptic number.

It is an amenable number.

91374904981 is a deficient number, since it is larger than the sum of its proper divisors (70456643).

91374904981 is a wasteful number, since it uses less digits than its factorization.

91374904981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15191.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 91374904981 in words is "ninety-one billion, three hundred seventy-four million, nine hundred four thousand, nine hundred eighty-one".