616891 has 4 divisors (see below), whose sum is σ = 672984. Its totient is φ = 560800.

The previous prime is 616877. The next prime is 616897. The reversal of 616891 is 198616.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 616891 - 2¹¹ = 614843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28030 + ... + 28051.

It is an arithmetic number, because the mean of its divisors is an integer number (168246).

2⁶¹⁶⁸⁹¹ is an apocalyptic number.

616891 is a deficient number, since it is larger than the sum of its proper divisors (56093).

616891 is a wasteful number, since it uses less digits than its factorization.

616891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56092.

The product of its digits is 2592, while the sum is 31.

The square root of 616891 is about 785.4240892664. The cubic root of 616891 is about 85.1274213472.

The spelling of 616891 in words is "six hundred sixteen thousand, eight hundred ninety-one".