91561474 has 8 divisors (see below), whose sum is σ = 139080960. Its totient is φ = 45201156.

The previous prime is 91561471. The next prime is 91561511. The reversal of 91561474 is 47416519.

91561474 = 373² + 374² + ... + 688².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (91561471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289594 + ... + 289909.

It is an arithmetic number, because the mean of its divisors is an integer number (17385120).

Almost surely, 2^91561474 is an apocalyptic number.

91561474 is a deficient number, since it is larger than the sum of its proper divisors (47519486).

91561474 is a wasteful number, since it uses less digits than its factorization.

91561474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579584.

The product of its digits is 30240, while the sum is 37.

The square root of 91561474 is about 9568.7759927798. The cubic root of 91561474 is about 450.7173316355.

The spelling of 91561474 in words is "ninety-one million, five hundred sixty-one thousand, four hundred seventy-four".