1644484957 has 2 divisors, whose sum is σ = 1644484958. Its totient is φ = 1644484956.

The previous prime is 1644484879. The next prime is 1644484967. The reversal of 1644484957 is 7594844461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1018184281 + 626300676 = 31909^2 + 25026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1644484957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1644484967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822242478 + 822242479.

It is an arithmetic number, because the mean of its divisors is an integer number (822242479).

Almost surely, 2^1644484957 is an apocalyptic number.

It is an amenable number.

1644484957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644484957 is an equidigital number, since it uses as much as digits as its factorization.

1644484957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 52.

The square root of 1644484957 is about 40552.2497156446. The cubic root of 1644484957 is about 1180.3477278847.

The spelling of 1644484957 in words is "one billion, six hundred forty-four million, four hundred eighty-four thousand, nine hundred fifty-seven".