91440351 has 12 divisors (see below), whose sum is σ = 132164760. Its totient is φ = 60921360.

The previous prime is 91440337. The next prime is 91440379. The reversal of 91440351 is 15304419.

It is not a de Polignac number, because 91440351 - 2⁶ = 91440287 is a prime.

It is a super-2 number, since 2×91440351² = 16722675582006402, which contains 22 as substring.

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 22021 + ... + 25841.

It is an arithmetic number, because the mean of its divisors is an integer number (11013730).

Almost surely, 2^91440351 is an apocalyptic number.

91440351 is a deficient number, since it is larger than the sum of its proper divisors (40724409).

91440351 is a wasteful number, since it uses less digits than its factorization.

91440351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6486 (or 6483 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 91440351 is about 9562.4448233702. Note that the first 3 decimals coincide. The cubic root of 91440351 is about 450.5184986427.

The spelling of 91440351 in words is "ninety-one million, four hundred forty thousand, three hundred fifty-one".