616537249 has 4 divisors (see below), whose sum is σ = 652804164. Its totient is φ = 580270336.

The previous prime is 616537237. The next prime is 616537261. The reversal of 616537249 is 942735616.

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

It is an interprime number because it is at equal distance from previous prime (616537237) and next prime (616537261).

It can be written as a sum of positive squares in 2 ways, for example, as 294980625 + 321556624 = 17175^2 + 17932^2 .

It is a cyclic number.

It is not a de Polignac number, because 616537249 - 2⁹ = 616536737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616537219) 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, 18133432 + ... + 18133465.

It is an arithmetic number, because the mean of its divisors is an integer number (163201041).

Almost surely, 2^616537249 is an apocalyptic number.

It is an amenable number.

616537249 is a deficient number, since it is larger than the sum of its proper divisors (36266915).

616537249 is a wasteful number, since it uses less digits than its factorization.

616537249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36266914.

The product of its digits is 272160, while the sum is 43.

The square root of 616537249 is about 24830.1681226688. The cubic root of 616537249 is about 851.1114636589. Note that the first 3 decimals are identical.

The spelling of 616537249 in words is "six hundred sixteen million, five hundred thirty-seven thousand, two hundred forty-nine".