610540621 has 2 divisors, whose sum is σ = 610540622. Its totient is φ = 610540620.

The previous prime is 610540607. The next prime is 610540633. The reversal of 610540621 is 126045016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605652100 + 4888521 = 24610^2 + 2211^2 .

It is a cyclic number.

It is not a de Polignac number, because 610540621 - 2⁷ = 610540493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610540121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305270310 + 305270311.

It is an arithmetic number, because the mean of its divisors is an integer number (305270311).

Almost surely, 2^610540621 is an apocalyptic number.

It is an amenable number.

610540621 is a deficient number, since it is larger than the sum of its proper divisors (1).

610540621 is an equidigital number, since it uses as much as digits as its factorization.

610540621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 610540621 is about 24709.1201988254. The cubic root of 610540621 is about 848.3430794998.

Adding to 610540621 its reverse (126045016), we get a palindrome (736585637).

The spelling of 610540621 in words is "six hundred ten million, five hundred forty thousand, six hundred twenty-one".