1909597979 has 2 divisors, whose sum is σ = 1909597980. Its totient is φ = 1909597978.

The previous prime is 1909597967. The next prime is 1909597993. The reversal of 1909597979 is 9797959091.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1909597979 - 2²⁰ = 1908549403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1909597909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954798989 + 954798990.

It is an arithmetic number, because the mean of its divisors is an integer number (954798990).

Almost surely, 2^1909597979 is an apocalyptic number.

1909597979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909597979 is an equidigital number, since it uses as much as digits as its factorization.

1909597979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14467005, while the sum is 65.

The square root of 1909597979 is about 43698.9471154626. The cubic root of 1909597979 is about 1240.6443882357.

The spelling of 1909597979 in words is "one billion, nine hundred nine million, five hundred ninety-seven thousand, nine hundred seventy-nine".