616644131 has 4 divisors (see below), whose sum is σ = 617096592. Its totient is φ = 616191672.

The previous prime is 616644113. The next prime is 616644143. The reversal of 616644131 is 131446616.

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 616644131 - 2¹⁰ = 616643107 is a prime.

It is a super-2 number, since 2×616644131² = 760499968593490322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616644151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224180 + ... + 226913.

It is an arithmetic number, because the mean of its divisors is an integer number (154274148).

Almost surely, 2^616644131 is an apocalyptic number.

616644131 is a deficient number, since it is larger than the sum of its proper divisors (452461).

616644131 is a wasteful number, since it uses less digits than its factorization.

616644131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452460.

The product of its digits is 10368, while the sum is 32.

The square root of 616644131 is about 24832.3202902991. The cubic root of 616644131 is about 851.1606432986.

The spelling of 616644131 in words is "six hundred sixteen million, six hundred forty-four thousand, one hundred thirty-one".