91451604 has 24 divisors (see below), whose sum is σ = 213672928. Its totient is φ = 30443040.

The previous prime is 91451603. The next prime is 91451623. The reversal of 91451604 is 40615419.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91451603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5034 + ... + 14430.

Almost surely, 2^91451604 is an apocalyptic number.

It is an amenable number.

91451604 is an abundant number, since it is smaller than the sum of its proper divisors (122221324).

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

91451604 is a wasteful number, since it uses less digits than its factorization.

91451604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10215 (or 10213 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 91451604 is about 9563.0332008208. The cubic root of 91451604 is about 450.5369787290.

The spelling of 91451604 in words is "ninety-one million, four hundred fifty-one thousand, six hundred four".