644014093 has 2 divisors, whose sum is σ = 644014094. Its totient is φ = 644014092.

The previous prime is 644014081. The next prime is 644014123. The reversal of 644014093 is 390410446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 553802089 + 90212004 = 23533^2 + 9498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644014093 is a prime.

It is a super-2 number, since 2×644014093² = 829508303965225298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644014493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322007046 + 322007047.

It is an arithmetic number, because the mean of its divisors is an integer number (322007047).

Almost surely, 2^644014093 is an apocalyptic number.

It is an amenable number.

644014093 is a deficient number, since it is larger than the sum of its proper divisors (1).

644014093 is an equidigital number, since it uses as much as digits as its factorization.

644014093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 644014093 is about 25377.4327503788. The cubic root of 644014093 is about 863.5718100942.

The spelling of 644014093 in words is "six hundred forty-four million, fourteen thousand, ninety-three".