816741979 has 4 divisors (see below), whose sum is σ = 819690784. Its totient is φ = 813793176.

The previous prime is 816741971. The next prime is 816741997. The reversal of 816741979 is 979147618.

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 816741979 - 2³ = 816741971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816741971) 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, 1473987 + ... + 1474540.

It is an arithmetic number, because the mean of its divisors is an integer number (204922696).

Almost surely, 2^816741979 is an apocalyptic number.

816741979 is a deficient number, since it is larger than the sum of its proper divisors (2948805).

816741979 is a wasteful number, since it uses less digits than its factorization.

816741979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2948804.

The product of its digits is 762048, while the sum is 52.

The square root of 816741979 is about 28578.6979934356. The cubic root of 816741979 is about 934.7488926943.

The spelling of 816741979 in words is "eight hundred sixteen million, seven hundred forty-one thousand, nine hundred seventy-nine".