641626453 has 4 divisors (see below), whose sum is σ = 690982348. Its totient is φ = 592270560.

The previous prime is 641626451. The next prime is 641626459. The reversal of 641626453 is 354626146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160833124 + 480793329 = 12682^2 + 21927^2 .

It is a cyclic number.

It is not a de Polignac number, because 641626453 - 2¹ = 641626451 is a prime.

It is a super-2 number, since 2×641626453² = 823369010378722418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641626451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24677928 + ... + 24677953.

It is an arithmetic number, because the mean of its divisors is an integer number (172745587).

Almost surely, 2^641626453 is an apocalyptic number.

It is an amenable number.

641626453 is a deficient number, since it is larger than the sum of its proper divisors (49355895).

641626453 is a wasteful number, since it uses less digits than its factorization.

641626453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49355894.

The product of its digits is 103680, while the sum is 37.

The square root of 641626453 is about 25330.3464840100. The cubic root of 641626453 is about 862.5032765541.

The spelling of 641626453 in words is "six hundred forty-one million, six hundred twenty-six thousand, four hundred fifty-three".