91811424016 has 45 divisors (see below), whose sum is σ = 192653701461. Its totient is φ = 42367231296.

The previous prime is 91811424013. The next prime is 91811424031. The reversal of 91811424016 is 61042411819.

The square root of 91811424016 is 303004.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13581571600 + 78229852416 = 116540^2 + 279696^2 .

It is not an unprimeable number, because it can be changed into a prime (91811424011) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15753295 + ... + 15759121.

Almost surely, 2^91811424016 is an apocalyptic number.

91811424016 is the 303004-th square number.

It is an amenable number.

91811424016 is an abundant number, since it is smaller than the sum of its proper divisors (100842277445).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91811424016 is an frugal number, since it uses more digits than its factorization.

91811424016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11688 (or 5842 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 91811424016 in words is "ninety-one billion, eight hundred eleven million, four hundred twenty-four thousand, sixteen".