64971331 has 16 divisors (see below), whose sum is σ = 70519680. Its totient is φ = 59633280.

The previous prime is 64971329. The next prime is 64971337. The reversal of 64971331 is 13317946.

It is not a de Polignac number, because 64971331 - 2¹ = 64971329 is a prime.

It is a super-2 number, since 2×64971331² = 8442547703823122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64971337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211480 + ... + 211786.

It is an arithmetic number, because the mean of its divisors is an integer number (4407480).

Almost surely, 2^64971331 is an apocalyptic number.

64971331 is a deficient number, since it is larger than the sum of its proper divisors (5548349).

64971331 is a wasteful number, since it uses less digits than its factorization.

64971331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594.

The product of its digits is 13608, while the sum is 34.

The square root of 64971331 is about 8060.4795763031. The cubic root of 64971331 is about 402.0134542497.

The spelling of 64971331 in words is "sixty-four million, nine hundred seventy-one thousand, three hundred thirty-one".