616735381 has 2 divisors, whose sum is σ = 616735382. Its totient is φ = 616735380.

The previous prime is 616735331. The next prime is 616735393. The reversal of 616735381 is 183537616.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421686225 + 195049156 = 20535^2 + 13966^2 .

It is a cyclic number.

It is not a de Polignac number, because 616735381 - 2⁷ = 616735253 is a prime.

It is a super-2 number, since 2×616735381² = 760725060354430322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616735321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308367690 + 308367691.

It is an arithmetic number, because the mean of its divisors is an integer number (308367691).

Almost surely, 2^616735381 is an apocalyptic number.

It is an amenable number.

616735381 is a deficient number, since it is larger than the sum of its proper divisors (1).

616735381 is an equidigital number, since it uses as much as digits as its factorization.

616735381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 616735381 is about 24834.1575456064. The cubic root of 616735381 is about 851.2026256857.

The spelling of 616735381 in words is "six hundred sixteen million, seven hundred thirty-five thousand, three hundred eighty-one".