1197947899 has 2 divisors, whose sum is σ = 1197947900. Its totient is φ = 1197947898.

The previous prime is 1197947869. The next prime is 1197947909. The reversal of 1197947899 is 9987497911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1197947899 - 2⁵ = 1197947867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1197947899.

It is not a weakly prime, because it can be changed into another prime (1197947819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 598973949 + 598973950.

It is an arithmetic number, because the mean of its divisors is an integer number (598973950).

Almost surely, 2^1197947899 is an apocalyptic number.

1197947899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1197947899 is an equidigital number, since it uses as much as digits as its factorization.

1197947899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 64.

The square root of 1197947899 is about 34611.3839509489. The cubic root of 1197947899 is about 1062.0524783645.

The spelling of 1197947899 in words is "one billion, one hundred ninety-seven million, nine hundred forty-seven thousand, eight hundred ninety-nine".