621455045 has 8 divisors (see below), whose sum is σ = 746515224. Its totient is φ = 496651264.

The previous prime is 621455039. The next prime is 621455053. The reversal of 621455045 is 540554126.

It can be written as a sum of positive squares in 4 ways, for example, as 88491649 + 532963396 = 9407^2 + 23086^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621455045 - 2¹⁴ = 621438661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58724 + ... + 68493.

It is an arithmetic number, because the mean of its divisors is an integer number (93314403).

Almost surely, 2^621455045 is an apocalyptic number.

It is an amenable number.

621455045 is a deficient number, since it is larger than the sum of its proper divisors (125060179).

621455045 is a wasteful number, since it uses less digits than its factorization.

621455045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128199.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 621455045 is about 24929.0000802278. Note that the first 4 decimals coincide. The cubic root of 621455045 is about 853.3684307498.

The spelling of 621455045 in words is "six hundred twenty-one million, four hundred fifty-five thousand, forty-five".