621604453 has 4 divisors (see below), whose sum is σ = 621900748. Its totient is φ = 621308160.

The previous prime is 621604441. The next prime is 621604537. The reversal of 621604453 is 354406126.

621604453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212634724 + 408969729 = 14582^2 + 20223^2 .

It is a cyclic number.

It is not a de Polignac number, because 621604453 - 2¹⁷ = 621473381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621604433) 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, 144978 + ... + 149203.

It is an arithmetic number, because the mean of its divisors is an integer number (155475187).

Almost surely, 2^621604453 is an apocalyptic number.

It is an amenable number.

621604453 is a deficient number, since it is larger than the sum of its proper divisors (296295).

621604453 is a wasteful number, since it uses less digits than its factorization.

621604453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296294.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 621604453 is about 24931.9965706720. The cubic root of 621604453 is about 853.4368131990.

The spelling of 621604453 in words is "six hundred twenty-one million, six hundred four thousand, four hundred fifty-three".