621239573 has 2 divisors, whose sum is σ = 621239574. Its totient is φ = 621239572.

The previous prime is 621239569. The next prime is 621239581. The reversal of 621239573 is 375932126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620109604 + 1129969 = 24902^2 + 1063^2 .

It is a cyclic number.

It is not a de Polignac number, because 621239573 - 2² = 621239569 is a prime.

It is a super-2 number, since 2×621239573² = 771877214122444658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621239273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310619786 + 310619787.

It is an arithmetic number, because the mean of its divisors is an integer number (310619787).

Almost surely, 2^621239573 is an apocalyptic number.

It is an amenable number.

621239573 is a deficient number, since it is larger than the sum of its proper divisors (1).

621239573 is an equidigital number, since it uses as much as digits as its factorization.

621239573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 38.

The square root of 621239573 is about 24924.6779919019. The cubic root of 621239573 is about 853.2697922081.

The spelling of 621239573 in words is "six hundred twenty-one million, two hundred thirty-nine thousand, five hundred seventy-three".