64863131 has 4 divisors (see below), whose sum is σ = 68277000. Its totient is φ = 61449264.

The previous prime is 64863121. The next prime is 64863167. The reversal of 64863131 is 13136846.

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 64863131 - 2¹⁰ = 64862107 is a prime.

It is a super-2 number, since 2×64863131² = 8414451526246322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64863121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1706906 + ... + 1706943.

It is an arithmetic number, because the mean of its divisors is an integer number (17069250).

Almost surely, 2^64863131 is an apocalyptic number.

64863131 is a deficient number, since it is larger than the sum of its proper divisors (3413869).

64863131 is a wasteful number, since it uses less digits than its factorization.

64863131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3413868.

The product of its digits is 10368, while the sum is 32.

The square root of 64863131 is about 8053.7650201629. The cubic root of 64863131 is about 401.7901658965.

Adding to 64863131 its reverse (13136846), we get a palindrome (77999977).

The spelling of 64863131 in words is "sixty-four million, eight hundred sixty-three thousand, one hundred thirty-one".