1223202091 has 2 divisors, whose sum is σ = 1223202092. Its totient is φ = 1223202090.

The previous prime is 1223202067. The next prime is 1223202137. The reversal of 1223202091 is 1902023221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1223202091 - 2⁹ = 1223201579 is a prime.

It is not a weakly prime, because it can be changed into another prime (1223202791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611601045 + 611601046.

It is an arithmetic number, because the mean of its divisors is an integer number (611601046).

Almost surely, 2^1223202091 is an apocalyptic number.

1223202091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223202091 is an equidigital number, since it uses as much as digits as its factorization.

1223202091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1223202091 is about 34974.3061546616. The cubic root of 1223202091 is about 1069.4637575624.

The spelling of 1223202091 in words is "one billion, two hundred twenty-three million, two hundred two thousand, ninety-one".