644014051 has 2 divisors, whose sum is σ = 644014052. Its totient is φ = 644014050.

The previous prime is 644014001. The next prime is 644014081. The reversal of 644014051 is 150410446.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644014051 is a prime.

It is not a weakly prime, because it can be changed into another prime (644014001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322007025 + 322007026.

It is an arithmetic number, because the mean of its divisors is an integer number (322007026).

Almost surely, 2^644014051 is an apocalyptic number.

644014051 is a deficient number, since it is larger than the sum of its proper divisors (1).

644014051 is an equidigital number, since it uses as much as digits as its factorization.

644014051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 644014051 is about 25377.4319228719. The cubic root of 644014051 is about 863.5717913213.

Adding to 644014051 its reverse (150410446), we get a palindrome (794424497).

The spelling of 644014051 in words is "six hundred forty-four million, fourteen thousand, fifty-one".