1198905971 has 2 divisors, whose sum is σ = 1198905972. Its totient is φ = 1198905970.

The previous prime is 1198905959. The next prime is 1198905979. The reversal of 1198905971 is 1795098911.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1198905971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1198905979) 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, 599452985 + 599452986.

It is an arithmetic number, because the mean of its divisors is an integer number (599452986).

Almost surely, 2^1198905971 is an apocalyptic number.

1198905971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198905971 is an equidigital number, since it uses as much as digits as its factorization.

1198905971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 50.

The square root of 1198905971 is about 34625.2216021790. The cubic root of 1198905971 is about 1062.3355323006.

The spelling of 1198905971 in words is "one billion, one hundred ninety-eight million, nine hundred five thousand, nine hundred seventy-one".