610621631 has 2 divisors, whose sum is σ = 610621632. Its totient is φ = 610621630.

The previous prime is 610621607. The next prime is 610621633. The reversal of 610621631 is 136126016.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-610621631 is a prime.

It is a super-2 number, since 2×610621631² = 745717552490200322, which contains 22 as substring.

Together with 610621633, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 610621631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610621633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305310815 + 305310816.

It is an arithmetic number, because the mean of its divisors is an integer number (305310816).

Almost surely, 2^610621631 is an apocalyptic number.

610621631 is a deficient number, since it is larger than the sum of its proper divisors (1).

610621631 is an equidigital number, since it uses as much as digits as its factorization.

610621631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 610621631 is about 24710.7594177111. The cubic root of 610621631 is about 848.3805988344.

Adding to 610621631 its reverse (136126016), we get a palindrome (746747647).

The spelling of 610621631 in words is "six hundred ten million, six hundred twenty-one thousand, six hundred thirty-one".