2155182979 has 8 divisors (see below), whose sum is σ = 2221613568. Its totient is φ = 2089609800.

The previous prime is 2155182947. The next prime is 2155182983. The reversal of 2155182979 is 9792815512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2155182979 - 2⁵ = 2155182947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155182479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209247 + ... + 219304.

It is an arithmetic number, because the mean of its divisors is an integer number (277701696).

Almost surely, 2^2155182979 is an apocalyptic number.

2155182979 is a deficient number, since it is larger than the sum of its proper divisors (66430589).

2155182979 is a wasteful number, since it uses less digits than its factorization.

2155182979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428705.

The product of its digits is 453600, while the sum is 49.

The square root of 2155182979 is about 46423.9483348842. The cubic root of 2155182979 is about 1291.6991768568.

The spelling of 2155182979 in words is "two billion, one hundred fifty-five million, one hundred eighty-two thousand, nine hundred seventy-nine".