32315891 has 4 divisors (see below), whose sum is σ = 32514312. Its totient is φ = 32117472.

The previous prime is 32315887. The next prime is 32315953. The reversal of 32315891 is 19851323.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 32315891 - 2² = 32315887 is a prime.

It is a super-2 number, since 2×32315891² = 2088633622247762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32315821) 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, 98966 + ... + 99291.

It is an arithmetic number, because the mean of its divisors is an integer number (8128578).

Almost surely, 2^32315891 is an apocalyptic number.

32315891 is a deficient number, since it is larger than the sum of its proper divisors (198421).

32315891 is a wasteful number, since it uses less digits than its factorization.

32315891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198420.

The product of its digits is 6480, while the sum is 32.

The square root of 32315891 is about 5684.7067646449. The cubic root of 32315891 is about 318.5214701289.

The spelling of 32315891 in words is "thirty-two million, three hundred fifteen thousand, eight hundred ninety-one".