32315981 has 4 divisors (see below), whose sum is σ = 33358464. Its totient is φ = 31273500.

The previous prime is 32315957. The next prime is 32316001. The reversal of 32315981 is 18951323.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18951323 = 31 ⋅611333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32315981 is a prime.

It is a super-2 number, since 2×32315981² = 2088645255984722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32315081) 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, 521195 + ... + 521256.

It is an arithmetic number, because the mean of its divisors is an integer number (8339616).

Almost surely, 2^32315981 is an apocalyptic number.

32315981 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

32315981 is a deficient number, since it is larger than the sum of its proper divisors (1042483).

32315981 is a wasteful number, since it uses less digits than its factorization.

32315981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042482.

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

The square root of 32315981 is about 5684.7146806150. The cubic root of 32315981 is about 318.5217658235.

The spelling of 32315981 in words is "thirty-two million, three hundred fifteen thousand, nine hundred eighty-one".