641657453 has 2 divisors, whose sum is σ = 641657454. Its totient is φ = 641657452.

The previous prime is 641657431. The next prime is 641657477. The reversal of 641657453 is 354756146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 639230089 + 2427364 = 25283^2 + 1558^2 .

It is a cyclic number.

It is not a de Polignac number, because 641657453 - 2¹² = 641653357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641657453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641657413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320828726 + 320828727.

It is an arithmetic number, because the mean of its divisors is an integer number (320828727).

Almost surely, 2^641657453 is an apocalyptic number.

It is an amenable number.

641657453 is a deficient number, since it is larger than the sum of its proper divisors (1).

641657453 is an equidigital number, since it uses as much as digits as its factorization.

641657453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 41.

The square root of 641657453 is about 25330.9583908703. The cubic root of 641657453 is about 862.5171668641.

The spelling of 641657453 in words is "six hundred forty-one million, six hundred fifty-seven thousand, four hundred fifty-three".