616937621 has 2 divisors, whose sum is σ = 616937622. Its totient is φ = 616937620.

The previous prime is 616937617. The next prime is 616937647. The reversal of 616937621 is 126739616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490622500 + 126315121 = 22150^2 + 11239^2 .

It is a cyclic number.

It is not a de Polignac number, because 616937621 - 2² = 616937617 is a prime.

It is a super-2 number, since 2×616937621² = 761224056410279282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616937821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308468810 + 308468811.

It is an arithmetic number, because the mean of its divisors is an integer number (308468811).

Almost surely, 2^616937621 is an apocalyptic number.

It is an amenable number.

616937621 is a deficient number, since it is larger than the sum of its proper divisors (1).

616937621 is an equidigital number, since it uses as much as digits as its factorization.

616937621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 616937621 is about 24838.2290230201. The cubic root of 616937621 is about 851.2956577007.

The spelling of 616937621 in words is "six hundred sixteen million, nine hundred thirty-seven thousand, six hundred twenty-one".