1863161979 has 16 divisors (see below), whose sum is σ = 2885648640. Its totient is φ = 1047209760.

The previous prime is 1863161939. The next prime is 1863161981. The reversal of 1863161979 is 9791613681.

It is not a de Polignac number, because 1863161979 - 2⁸ = 1863161723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1863161939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 725949 + ... + 728510.

It is an arithmetic number, because the mean of its divisors is an integer number (180353040).

Almost surely, 2^1863161979 is an apocalyptic number.

1863161979 is a deficient number, since it is larger than the sum of its proper divisors (1022486661).

1863161979 is a wasteful number, since it uses less digits than its factorization.

1863161979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454530.

The product of its digits is 489888, while the sum is 51.

The square root of 1863161979 is about 43164.3600554902. The cubic root of 1863161979 is about 1230.5054390446.

The spelling of 1863161979 in words is "one billion, eight hundred sixty-three million, one hundred sixty-one thousand, nine hundred seventy-nine".