620922521 has 2 divisors, whose sum is σ = 620922522. Its totient is φ = 620922520.

The previous prime is 620922503. The next prime is 620922551. The reversal of 620922521 is 125229026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616777225 + 4145296 = 24835^2 + 2036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620922521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (620922551) 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 as a sum of consecutive naturals, namely, 310461260 + 310461261.

It is an arithmetic number, because the mean of its divisors is an integer number (310461261).

Almost surely, 2^620922521 is an apocalyptic number.

It is an amenable number.

620922521 is a deficient number, since it is larger than the sum of its proper divisors (1).

620922521 is an equidigital number, since it uses as much as digits as its factorization.

620922521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 620922521 is about 24918.3169776773. The cubic root of 620922521 is about 853.1246110031.

The spelling of 620922521 in words is "six hundred twenty million, nine hundred twenty-two thousand, five hundred twenty-one".