610605621 has 10 divisors (see below), whose sum is σ = 912139382. Its totient is φ = 407070360.

The previous prime is 610605613. The next prime is 610605629. The reversal of 610605621 is 126506016.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (610605613) and next prime (610605629).

It can be written as a sum of positive squares in only one way, i.e., 504227025 + 106378596 = 22455^2 + 10314^2 .

It is not a de Polignac number, because 610605621 - 2³ = 610605613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610605629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3769090 + ... + 3769251.

Almost surely, 2^610605621 is an apocalyptic number.

It is an amenable number.

610605621 is a deficient number, since it is larger than the sum of its proper divisors (301533761).

610605621 is an equidigital number, since it uses as much as digits as its factorization.

610605621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7538353 (or 7538344 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 610605621 is about 24710.4354676319. The cubic root of 610605621 is about 848.3731841543.

The spelling of 610605621 in words is "six hundred ten million, six hundred five thousand, six hundred twenty-one".