621573361 has 2 divisors, whose sum is σ = 621573362. Its totient is φ = 621573360.

The previous prime is 621573349. The next prime is 621573371. The reversal of 621573361 is 163375126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562590961 + 58982400 = 23719^2 + 7680^2 .

It is a cyclic number.

It is not a de Polignac number, because 621573361 - 2⁹ = 621572849 is a prime.

It is not a weakly prime, because it can be changed into another prime (621573331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310786680 + 310786681.

It is an arithmetic number, because the mean of its divisors is an integer number (310786681).

Almost surely, 2^621573361 is an apocalyptic number.

It is an amenable number.

621573361 is a deficient number, since it is larger than the sum of its proper divisors (1).

621573361 is an equidigital number, since it uses as much as digits as its factorization.

621573361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The square root of 621573361 is about 24931.3730267709. The cubic root of 621573361 is about 853.4225836249.

The spelling of 621573361 in words is "six hundred twenty-one million, five hundred seventy-three thousand, three hundred sixty-one".