616940391 has 8 divisors (see below), whose sum is σ = 823697280. Its totient is φ = 410738552.

The previous prime is 616940381. The next prime is 616940413. The reversal of 616940391 is 193049616.

616940391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 616940391 - 2¹⁹ = 616416103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616940381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136161 + ... + 140618.

It is an arithmetic number, because the mean of its divisors is an integer number (102962160).

Almost surely, 2^616940391 is an apocalyptic number.

616940391 is a deficient number, since it is larger than the sum of its proper divisors (206756889).

616940391 is a wasteful number, since it uses less digits than its factorization.

616940391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277525.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 616940391 is about 24838.2847837768. The cubic root of 616940391 is about 851.2969317817.

The spelling of 616940391 in words is "six hundred sixteen million, nine hundred forty thousand, three hundred ninety-one".