64441531 has 16 divisors (see below), whose sum is σ = 82517760. Its totient is φ = 48854880.

The previous prime is 64441519. The next prime is 64441537. The reversal of 64441531 is 13514446.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64441531 is a prime.

It is a super-2 number, since 2×64441531² = 8305421835247922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64441531.

It is not an unprimeable number, because it can be changed into a prime (64441537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8461 + ... + 14158.

It is an arithmetic number, because the mean of its divisors is an integer number (5157360).

Almost surely, 2^64441531 is an apocalyptic number.

64441531 is a deficient number, since it is larger than the sum of its proper divisors (18076229).

64441531 is a wasteful number, since it uses less digits than its factorization.

64441531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22674.

The product of its digits is 5760, while the sum is 28.

The square root of 64441531 is about 8027.5482558500. The cubic root of 64441531 is about 400.9177489816.

Adding to 64441531 its reverse (13514446), we get a palindrome (77955977).

It can be divided in two parts, 644415 and 31, that added together give a palindrome (644446).

The spelling of 64441531 in words is "sixty-four million, four hundred forty-one thousand, five hundred thirty-one".