64313531 has 4 divisors (see below), whose sum is σ = 65681952. Its totient is φ = 62945112.

The previous prime is 64313519. The next prime is 64313563. The reversal of 64313531 is 13531346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13531346 = 2 ⋅6765673.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64313531 is a prime.

It is a super-2 number, since 2×64313531² = 8272460539375922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64313531.

It is not an unprimeable number, because it can be changed into a prime (64316531) 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, 684140 + ... + 684233.

It is an arithmetic number, because the mean of its divisors is an integer number (16420488).

Almost surely, 2^64313531 is an apocalyptic number.

64313531 is a deficient number, since it is larger than the sum of its proper divisors (1368421).

64313531 is a wasteful number, since it uses less digits than its factorization.

64313531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368420.

The product of its digits is 3240, while the sum is 26.

The square root of 64313531 is about 8019.5717466708. The cubic root of 64313531 is about 400.6521258353.

Adding to 64313531 its reverse (13531346), we get a palindrome (77844877).

The spelling of 64313531 in words is "sixty-four million, three hundred thirteen thousand, five hundred thirty-one".