1197821903 has 2 divisors, whose sum is σ = 1197821904. Its totient is φ = 1197821902.

The previous prime is 1197821869. The next prime is 1197821909. The reversal of 1197821903 is 3091287911.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1197821903 - 2³⁰ = 124080079 is a prime.

It is a super-2 number, since 2×1197821903² = 2869554622613082818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1197821909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 598910951 + 598910952.

It is an arithmetic number, because the mean of its divisors is an integer number (598910952).

Almost surely, 2^1197821903 is an apocalyptic number.

1197821903 is a deficient number, since it is larger than the sum of its proper divisors (1).

1197821903 is an equidigital number, since it uses as much as digits as its factorization.

1197821903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 1197821903 is about 34609.5637505011. The cubic root of 1197821903 is about 1062.0152427285.

The spelling of 1197821903 in words is "one billion, one hundred ninety-seven million, eight hundred twenty-one thousand, nine hundred three".