64001531 has 4 divisors (see below), whose sum is σ = 69819864. Its totient is φ = 58183200.

The previous prime is 64001507. The next prime is 64001537. The reversal of 64001531 is 13510046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64001531 is a prime.

It is a super-2 number, since 2×64001531² = 8192391940687922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64001537) 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, 2909150 + ... + 2909171.

It is an arithmetic number, because the mean of its divisors is an integer number (17454966).

Almost surely, 2^64001531 is an apocalyptic number.

64001531 is a deficient number, since it is larger than the sum of its proper divisors (5818333).

64001531 is a wasteful number, since it uses less digits than its factorization.

64001531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5818332.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 64001531 is about 8000.0956869278. The cubic root of 64001531 is about 400.0031895579.

Adding to 64001531 its reverse (13510046), we get a palindrome (77511577).

It can be divided in two parts, 640015 and 31, that added together give a palindrome (640046).

The spelling of 64001531 in words is "sixty-four million, one thousand, five hundred thirty-one".