616505131 has 16 divisors (see below), whose sum is σ = 682795008. Its totient is φ = 551980800.

The previous prime is 616505129. The next prime is 616505143. The reversal of 616505131 is 131505616.

It is a cyclic number.

It is not a de Polignac number, because 616505131 - 2¹ = 616505129 is a prime.

It is a super-2 number, since 2×616505131² = 760157153098654322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 616505131.

It is not an unprimeable number, because it can be changed into a prime (616505191) 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, 236646 + ... + 239236.

It is an arithmetic number, because the mean of its divisors is an integer number (42674688).

Almost surely, 2^616505131 is an apocalyptic number.

616505131 is a deficient number, since it is larger than the sum of its proper divisors (66289877).

616505131 is a wasteful number, since it uses less digits than its factorization.

616505131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 616505131 is about 24829.5213606706. The cubic root of 616505131 is about 851.0966840855.

The spelling of 616505131 in words is "six hundred sixteen million, five hundred five thousand, one hundred thirty-one".