64651031 has 4 divisors (see below), whose sum is σ = 64706064. Its totient is φ = 64596000.

The previous prime is 64651007. The next prime is 64651057. The reversal of 64651031 is 13015646.

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 64651031 - 2¹⁸ = 64388887 is a prime.

It is a super-2 number, since 2×64651031² = 8359511618725922, 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 (64651331) 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, 25715 + ... + 28116.

It is an arithmetic number, because the mean of its divisors is an integer number (16176516).

Almost surely, 2^64651031 is an apocalyptic number.

64651031 is a deficient number, since it is larger than the sum of its proper divisors (55033).

64651031 is a wasteful number, since it uses less digits than its factorization.

64651031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55032.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 64651031 is about 8040.5864835844. The cubic root of 64651031 is about 401.3517414255.

Adding to 64651031 its reverse (13015646), we get a palindrome (77666677).

The spelling of 64651031 in words is "sixty-four million, six hundred fifty-one thousand, thirty-one".