1197902921 has 2 divisors, whose sum is σ = 1197902922. Its totient is φ = 1197902920.

The previous prime is 1197902911. The next prime is 1197903001. The reversal of 1197902921 is 1292097911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 750157321 + 447745600 = 27389^2 + 21160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1197902921 - 2¹⁰ = 1197901897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1197902911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 598951460 + 598951461.

It is an arithmetic number, because the mean of its divisors is an integer number (598951461).

Almost surely, 2^1197902921 is an apocalyptic number.

It is an amenable number.

1197902921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1197902921 is an equidigital number, since it uses as much as digits as its factorization.

1197902921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 41.

The square root of 1197902921 is about 34610.7341875321. The cubic root of 1197902921 is about 1062.0391863023.

The spelling of 1197902921 in words is "one billion, one hundred ninety-seven million, nine hundred two thousand, nine hundred twenty-one".