1979173147 has 4 divisors (see below), whose sum is σ = 2261912176. Its totient is φ = 1696434120.

The previous prime is 1979173127. The next prime is 1979173151. The reversal of 1979173147 is 7413719791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1979173147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1979173147.

It is not an unprimeable number, because it can be changed into a prime (1979173127) 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, 141369504 + ... + 141369517.

It is an arithmetic number, because the mean of its divisors is an integer number (565478044).

Almost surely, 2^1979173147 is an apocalyptic number.

1979173147 is a deficient number, since it is larger than the sum of its proper divisors (282739029).

1979173147 is an equidigital number, since it uses as much as digits as its factorization.

1979173147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282739028.

The product of its digits is 333396, while the sum is 49.

The square root of 1979173147 is about 44487.8988827299. The cubic root of 1979173147 is about 1255.5324158024.

The spelling of 1979173147 in words is "one billion, nine hundred seventy-nine million, one hundred seventy-three thousand, one hundred forty-seven".