616997381 has 32 divisors (see below), whose sum is σ = 832204800. Its totient is φ = 441766080.

The previous prime is 616997377. The next prime is 616997383. The reversal of 616997381 is 183799616.

It is not a de Polignac number, because 616997381 - 2² = 616997377 is a prime.

It is a super-2 number, since 2×616997381² = 761371536321718322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616997383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237950 + ... + 240528.

It is an arithmetic number, because the mean of its divisors is an integer number (26006400).

Almost surely, 2^616997381 is an apocalyptic number.

It is an amenable number.

616997381 is a deficient number, since it is larger than the sum of its proper divisors (215207419).

616997381 is a wasteful number, since it uses less digits than its factorization.

616997381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849.

The product of its digits is 489888, while the sum is 50.

The square root of 616997381 is about 24839.4319782076. The cubic root of 616997381 is about 851.3231438864.

The spelling of 616997381 in words is "six hundred sixteen million, nine hundred ninety-seven thousand, three hundred eighty-one".