616031621 has 4 divisors (see below), whose sum is σ = 618134412. Its totient is φ = 613928832.

The previous prime is 616031593. The next prime is 616031639. The reversal of 616031621 is 126130616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 576480100 + 39551521 = 24010^2 + 6289^2 .

It is a cyclic number.

It is not a de Polignac number, because 616031621 - 2¹⁸ = 615769477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616030621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050956 + ... + 1051541.

It is an arithmetic number, because the mean of its divisors is an integer number (154533603).

Almost surely, 2^616031621 is an apocalyptic number.

It is an amenable number.

616031621 is a deficient number, since it is larger than the sum of its proper divisors (2102791).

616031621 is a wasteful number, since it uses less digits than its factorization.

616031621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102790.

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

The square root of 616031621 is about 24819.9843070055. The cubic root of 616031621 is about 850.8787318518.

The spelling of 616031621 in words is "six hundred sixteen million, thirty-one thousand, six hundred twenty-one".