621331045 has 16 divisors (see below), whose sum is σ = 790061040. Its totient is φ = 467467264.

The previous prime is 621331033. The next prime is 621331049. The reversal of 621331045 is 540133126.

It can be written as a sum of positive squares in 8 ways, for example, as 2217121 + 619113924 = 1489^2 + 24882^2 .

It is a cyclic number.

It is not a de Polignac number, because 621331045 - 2⁵ = 621331013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621331049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174099 + ... + 177631.

It is an arithmetic number, because the mean of its divisors is an integer number (49378815).

Almost surely, 2^621331045 is an apocalyptic number.

It is an amenable number.

621331045 is a deficient number, since it is larger than the sum of its proper divisors (168729995).

621331045 is a wasteful number, since it uses less digits than its factorization.

621331045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5624.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 621331045 is about 24926.5128929018. The cubic root of 621331045 is about 853.3116689480.

The spelling of 621331045 in words is "six hundred twenty-one million, three hundred thirty-one thousand, forty-five".