616268981 has 4 divisors (see below), whose sum is σ = 619673964. Its totient is φ = 612864000.

The previous prime is 616268977. The next prime is 616269013. The reversal of 616268981 is 189862616.

616268981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37625956 + 578643025 = 6134^2 + 24055^2 .

It is a cyclic number.

It is not a de Polignac number, because 616268981 - 2² = 616268977 is a prime.

It is a super-2 number, since 2×616268981² = 759574913885556722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616261981) 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, 1702220 + ... + 1702581.

It is an arithmetic number, because the mean of its divisors is an integer number (154918491).

Almost surely, 2^616268981 is an apocalyptic number.

It is an amenable number.

616268981 is a deficient number, since it is larger than the sum of its proper divisors (3404983).

616268981 is a wasteful number, since it uses less digits than its factorization.

616268981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404982.

The product of its digits is 248832, while the sum is 47.

The square root of 616268981 is about 24824.7654772407. The cubic root of 616268981 is about 850.9880003997.

It can be divided in two parts, 61626 and 8981, that added together give a palindrome (70607).

The spelling of 616268981 in words is "six hundred sixteen million, two hundred sixty-eight thousand, nine hundred eighty-one".