1230202091 has 2 divisors, whose sum is σ = 1230202092. Its totient is φ = 1230202090.

The previous prime is 1230202087. The next prime is 1230202123. The reversal of 1230202091 is 1902020321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1230202091 - 2² = 1230202087 is a prime.

It is not a weakly prime, because it can be changed into another prime (1230202031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615101045 + 615101046.

It is an arithmetic number, because the mean of its divisors is an integer number (615101046).

Almost surely, 2^1230202091 is an apocalyptic number.

1230202091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230202091 is an equidigital number, since it uses as much as digits as its factorization.

1230202091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1230202091 is about 35074.2368555611. The cubic root of 1230202091 is about 1071.4999463249.

The spelling of 1230202091 in words is "one billion, two hundred thirty million, two hundred two thousand, ninety-one".