621732457 has 2 divisors, whose sum is σ = 621732458. Its totient is φ = 621732456.

The previous prime is 621732443. The next prime is 621732469. The reversal of 621732457 is 754237126.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 528494121 + 93238336 = 22989^2 + 9656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621732457 is a prime.

It is not a weakly prime, because it can be changed into another prime (621733457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310866228 + 310866229.

It is an arithmetic number, because the mean of its divisors is an integer number (310866229).

Almost surely, 2^621732457 is an apocalyptic number.

It is an amenable number.

621732457 is a deficient number, since it is larger than the sum of its proper divisors (1).

621732457 is an equidigital number, since it uses as much as digits as its factorization.

621732457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 37.

The square root of 621732457 is about 24934.5635012927. The cubic root of 621732457 is about 853.4953905507.

The spelling of 621732457 in words is "six hundred twenty-one million, seven hundred thirty-two thousand, four hundred fifty-seven".