616915091 has 16 divisors (see below), whose sum is σ = 718429824. Its totient is φ = 524550144.

The previous prime is 616915031. The next prime is 616915099. The reversal of 616915091 is 190519616.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616915091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616915099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19310 + ... + 40083.

It is an arithmetic number, because the mean of its divisors is an integer number (44901864).

Almost surely, 2^616915091 is an apocalyptic number.

616915091 is a deficient number, since it is larger than the sum of its proper divisors (101514733).

616915091 is a wasteful number, since it uses less digits than its factorization.

616915091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59470.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 616915091 is about 24837.7754841290. The cubic root of 616915091 is about 851.2852947272.

The spelling of 616915091 in words is "six hundred sixteen million, nine hundred fifteen thousand, ninety-one".