64291631 has 4 divisors (see below), whose sum is σ = 64314264. Its totient is φ = 64269000.

The previous prime is 64291627. The next prime is 64291639. The reversal of 64291631 is 13619246.

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 64291631 - 2² = 64291627 is a prime.

It is a super-2 number, since 2×64291631² = 8266827633280322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64291639) 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, 6320 + ... + 12981.

It is an arithmetic number, because the mean of its divisors is an integer number (16078566).

Almost surely, 2^64291631 is an apocalyptic number.

64291631 is a deficient number, since it is larger than the sum of its proper divisors (22633).

64291631 is a wasteful number, since it uses less digits than its factorization.

64291631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22632.

The product of its digits is 7776, while the sum is 32.

The square root of 64291631 is about 8018.2062208452. The cubic root of 64291631 is about 400.6066440756.

The spelling of 64291631 in words is "sixty-four million, two hundred ninety-one thousand, six hundred thirty-one".