610816981 has 4 divisors (see below), whose sum is σ = 611410464. Its totient is φ = 610223500.

The previous prime is 610816961. The next prime is 610817023. The reversal of 610816981 is 189618016.

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 610816981 - 2⁵ = 610816949 is a prime.

It is a super-2 number, since 2×610816981² = 746194768555908722, 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 (610816951) 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, 295195 + ... + 297256.

It is an arithmetic number, because the mean of its divisors is an integer number (152852616).

Almost surely, 2^610816981 is an apocalyptic number.

It is an amenable number.

610816981 is a deficient number, since it is larger than the sum of its proper divisors (593483).

610816981 is a wasteful number, since it uses less digits than its factorization.

610816981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593482.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 610816981 is about 24714.7118332381. The cubic root of 610816981 is about 848.4710604618.

The spelling of 610816981 in words is "six hundred ten million, eight hundred sixteen thousand, nine hundred eighty-one".