91572951 has 8 divisors (see below), whose sum is σ = 128523520. Its totient is φ = 57835512.

The previous prime is 91572907. The next prime is 91572979. The reversal of 91572951 is 15927519.

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

It is not a de Polignac number, because 91572951 - 2⁷ = 91572823 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 (91572991) 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, 803215 + ... + 803328.

It is an arithmetic number, because the mean of its divisors is an integer number (16065440).

Almost surely, 2^91572951 is an apocalyptic number.

91572951 is a deficient number, since it is larger than the sum of its proper divisors (36950569).

91572951 is a wasteful number, since it uses less digits than its factorization.

91572951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606565.

The product of its digits is 28350, while the sum is 39.

The square root of 91572951 is about 9569.3756849650. The cubic root of 91572951 is about 450.7361629426.

The spelling of 91572951 in words is "ninety-one million, five hundred seventy-two thousand, nine hundred fifty-one".