65631313 has 4 divisors (see below), whose sum is σ = 71597808. Its totient is φ = 59664820.

The previous prime is 65631299. The next prime is 65631341. The reversal of 65631313 is 31313656.

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.

It is a cyclic number.

It is not a de Polignac number, because 65631313 - 2⁵ = 65631281 is a prime.

It is a super-2 number, since 2×65631313² = 8614938492207938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65631413) 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, 2983231 + ... + 2983252.

It is an arithmetic number, because the mean of its divisors is an integer number (17899452).

Almost surely, 2^65631313 is an apocalyptic number.

It is an amenable number.

65631313 is a deficient number, since it is larger than the sum of its proper divisors (5966495).

65631313 is a wasteful number, since it uses less digits than its factorization.

65631313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5966494.

The product of its digits is 4860, while the sum is 28.

The square root of 65631313 is about 8101.3155104588. The cubic root of 65631313 is about 403.3700951550.

Adding to 65631313 its reverse (31313656), we get a palindrome (96944969).

The spelling of 65631313 in words is "sixty-five million, six hundred thirty-one thousand, three hundred thirteen".