91900135892 has 6 divisors (see below), whose sum is σ = 160825237818. Its totient is φ = 45950067944.

The previous prime is 91900135849. The next prime is 91900135897. The reversal of 91900135892 is 29853100919.

It can be written as a sum of positive squares in only one way, i.e., 87264704836 + 4635431056 = 295406^2 + 68084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91900135897) 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 as a sum of consecutive naturals, namely, 11487516983 + ... + 11487516990.

It is an arithmetic number, because the mean of its divisors is an integer number (26804206303).

Almost surely, 2^91900135892 is an apocalyptic number.

It is an amenable number.

91900135892 is a deficient number, since it is larger than the sum of its proper divisors (68925101926).

91900135892 is a wasteful number, since it uses less digits than its factorization.

91900135892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22975033977 (or 22975033975 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 91900135892 in words is "ninety-one billion, nine hundred million, one hundred thirty-five thousand, eight hundred ninety-two".