616229981 has 4 divisors (see below), whose sum is σ = 617188992. Its totient is φ = 615270972.

The previous prime is 616229969. The next prime is 616230029. The reversal of 616229981 is 189922616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 616229981 - 2¹⁴ = 616213597 is a prime.

It is a super-2 number, since 2×616229981² = 759478778966520722, 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 (616259981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478541 + ... + 479826.

It is an arithmetic number, because the mean of its divisors is an integer number (154297248).

Almost surely, 2^616229981 is an apocalyptic number.

It is an amenable number.

616229981 is a deficient number, since it is larger than the sum of its proper divisors (959011).

616229981 is an equidigital number, since it uses as much as digits as its factorization.

616229981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959010.

The product of its digits is 93312, while the sum is 44.

The square root of 616229981 is about 24823.9799589026. The cubic root of 616229981 is about 850.9700486972.

The spelling of 616229981 in words is "six hundred sixteen million, two hundred twenty-nine thousand, nine hundred eighty-one".