616919391 has 48 divisors (see below), whose sum is σ = 989614080. Its totient is φ = 367234560.

The previous prime is 616919377. The next prime is 616919393. The reversal of 616919391 is 193919616.

It is a de Polignac number, because none of the positive numbers 2^k-616919391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616919393) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1747471 + ... + 1747823.

It is an arithmetic number, because the mean of its divisors is an integer number (20616960).

Almost surely, 2^616919391 is an apocalyptic number.

616919391 is a deficient number, since it is larger than the sum of its proper divisors (372694689).

616919391 is a wasteful number, since it uses less digits than its factorization.

616919391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 633 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 616919391 is about 24837.8620456753. The cubic root of 616919391 is about 851.2872725890.

The spelling of 616919391 in words is "six hundred sixteen million, nine hundred nineteen thousand, three hundred ninety-one".