91440556 has 6 divisors (see below), whose sum is σ = 160020980. Its totient is φ = 45720276.

The previous prime is 91440553. The next prime is 91440589. The reversal of 91440556 is 65504419.

It is a super-2 number, since 2×91440556² = 16722750563178272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91440551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11430066 + ... + 11430073.

Almost surely, 2^91440556 is an apocalyptic number.

It is an amenable number.

91440556 is a deficient number, since it is larger than the sum of its proper divisors (68580424).

91440556 is a wasteful number, since it uses less digits than its factorization.

91440556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22860143 (or 22860141 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 91440556 is about 9562.4555423803. The cubic root of 91440556 is about 450.5188353148.

The spelling of 91440556 in words is "ninety-one million, four hundred forty thousand, five hundred fifty-six".