91631895 has 8 divisors (see below), whose sum is σ = 146611056. Its totient is φ = 48870336.

The previous prime is 91631873. The next prime is 91631899. The reversal of 91631895 is 59813619.

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

It is not a de Polignac number, because 91631895 - 2⁹ = 91631383 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91631899) 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, 3054382 + ... + 3054411.

It is an arithmetic number, because the mean of its divisors is an integer number (18326382).

Almost surely, 2^91631895 is an apocalyptic number.

91631895 is a deficient number, since it is larger than the sum of its proper divisors (54979161).

91631895 is a wasteful number, since it uses less digits than its factorization.

91631895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6108801.

The product of its digits is 58320, while the sum is 42.

The square root of 91631895 is about 9572.4550142584. The cubic root of 91631895 is about 450.8328526806.

The spelling of 91631895 in words is "ninety-one million, six hundred thirty-one thousand, eight hundred ninety-five".