1791855979 has 2 divisors, whose sum is σ = 1791855980. Its totient is φ = 1791855978.

The previous prime is 1791855953. The next prime is 1791855983. The reversal of 1791855979 is 9795581971.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1791855979 - 2⁹ = 1791855467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1791855379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895927989 + 895927990.

It is an arithmetic number, because the mean of its divisors is an integer number (895927990).

Almost surely, 2^1791855979 is an apocalyptic number.

1791855979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791855979 is an equidigital number, since it uses as much as digits as its factorization.

1791855979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7144200, while the sum is 61.

The square root of 1791855979 is about 42330.3198546857. The cubic root of 1791855979 is about 1214.6030482520.

The spelling of 1791855979 in words is "one billion, seven hundred ninety-one million, eight hundred fifty-five thousand, nine hundred seventy-nine".