1980815479 has 2 divisors, whose sum is σ = 1980815480. Its totient is φ = 1980815478.

The previous prime is 1980815467. The next prime is 1980815489. The reversal of 1980815479 is 9745180891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1980815479 - 2²¹ = 1978718327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980815489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990407739 + 990407740.

It is an arithmetic number, because the mean of its divisors is an integer number (990407740).

Almost surely, 2^1980815479 is an apocalyptic number.

1980815479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980815479 is an equidigital number, since it uses as much as digits as its factorization.

1980815479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 52.

The square root of 1980815479 is about 44506.3532431045. The cubic root of 1980815479 is about 1255.8796030398.

The spelling of 1980815479 in words is "one billion, nine hundred eighty million, eight hundred fifteen thousand, four hundred seventy-nine".