74171561 has 16 divisors (see below), whose sum is σ = 81515520. Its totient is φ = 67417920.

The previous prime is 74171551. The next prime is 74171563. The reversal of 74171561 is 16517147.

It is a de Polignac number, because none of the positive numbers 2^k-74171561 is a prime.

It is a super-2 number, since 2×74171561² = 11002840922353442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74171563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152060 + ... + 152546.

It is an arithmetic number, because the mean of its divisors is an integer number (5094720).

Almost surely, 2^74171561 is an apocalyptic number.

It is an amenable number.

74171561 is a deficient number, since it is larger than the sum of its proper divisors (7343959).

74171561 is an equidigital number, since it uses as much as digits as its factorization.

74171561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 535 counting only the distinct ones).

The product of its digits is 5880, while the sum is 32.

The square root of 74171561 is about 8612.2912746841. The cubic root of 74171561 is about 420.1578412785.

The spelling of 74171561 in words is "seventy-four million, one hundred seventy-one thousand, five hundred sixty-one".