91731939412 has 12 divisors (see below), whose sum is σ = 169973887860. Its totient is φ = 43167971456.

The previous prime is 91731939401. The next prime is 91731939413. The reversal of 91731939412 is 21493913719.

It can be written as a sum of positive squares in 2 ways, for example, as 49869142596 + 41862796816 = 223314^2 + 204604^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91731939413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674499487 + ... + 674499622.

It is an arithmetic number, because the mean of its divisors is an integer number (14164490655).

Almost surely, 2^91731939412 is an apocalyptic number.

It is an amenable number.

91731939412 is a deficient number, since it is larger than the sum of its proper divisors (78241948448).

91731939412 is a wasteful number, since it uses less digits than its factorization.

91731939412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348999130 (or 1348999128 counting only the distinct ones).

The product of its digits is 367416, while the sum is 49.

The spelling of 91731939412 in words is "ninety-one billion, seven hundred thirty-one million, nine hundred thirty-nine thousand, four hundred twelve".