74521591 has 12 divisors (see below), whose sum is σ = 83283552. Its totient is φ = 66441024.

The previous prime is 74521583. The next prime is 74521597. The reversal of 74521591 is 19512547.

It is not a de Polignac number, because 74521591 - 2³ = 74521583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74521597) 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, 66 + ... + 12208.

It is an arithmetic number, because the mean of its divisors is an integer number (6940296).

Almost surely, 2^74521591 is an apocalyptic number.

74521591 is a deficient number, since it is larger than the sum of its proper divisors (8761961).

74521591 is a wasteful number, since it uses less digits than its factorization.

74521591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12198 (or 12179 counting only the distinct ones).

The product of its digits is 12600, while the sum is 34.

The square root of 74521591 is about 8632.5888932579. The cubic root of 74521591 is about 420.8177397832.

The spelling of 74521591 in words is "seventy-four million, five hundred twenty-one thousand, five hundred ninety-one".