91573481 has 4 divisors (see below), whose sum is σ = 91593600. Its totient is φ = 91553364.

The previous prime is 91573439. The next prime is 91573499. The reversal of 91573481 is 18437519.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91573481 is a prime.

It is a super-2 number, since 2×91573481² = 16771404844914722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91573081) 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, 380 + ... + 13538.

It is an arithmetic number, because the mean of its divisors is an integer number (22898400).

Almost surely, 2^91573481 is an apocalyptic number.

It is an amenable number.

91573481 is a deficient number, since it is larger than the sum of its proper divisors (20119).

91573481 is a wasteful number, since it uses less digits than its factorization.

91573481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20118.

The product of its digits is 30240, while the sum is 38.

The square root of 91573481 is about 9569.4033774316. The cubic root of 91573481 is about 450.7370325214.

The spelling of 91573481 in words is "ninety-one million, five hundred seventy-three thousand, four hundred eighty-one".