616195991 has 8 divisors (see below), whose sum is σ = 666325440. Its totient is φ = 567609088.

The previous prime is 616195969. The next prime is 616196003. The reversal of 616195991 is 199591616.

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 616195991 - 2⁶ = 616195927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616195961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384806 + ... + 386403.

It is an arithmetic number, because the mean of its divisors is an integer number (83290680).

Almost surely, 2^616195991 is an apocalyptic number.

616195991 is a deficient number, since it is larger than the sum of its proper divisors (50129449).

616195991 is a wasteful number, since it uses less digits than its factorization.

616195991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771273.

The product of its digits is 131220, while the sum is 47.

The square root of 616195991 is about 24823.2953291863. The cubic root of 616195991 is about 850.9544024804.

The spelling of 616195991 in words is "six hundred sixteen million, one hundred ninety-five thousand, nine hundred ninety-one".