1229156923 has 2 divisors, whose sum is σ = 1229156924. Its totient is φ = 1229156922.

The previous prime is 1229156881. The next prime is 1229156941. The reversal of 1229156923 is 3296519221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1229156923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1229156953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614578461 + 614578462.

It is an arithmetic number, because the mean of its divisors is an integer number (614578462).

Almost surely, 2^1229156923 is an apocalyptic number.

1229156923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229156923 is an equidigital number, since it uses as much as digits as its factorization.

1229156923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 1229156923 is about 35059.3343205486. The cubic root of 1229156923 is about 1071.1964149606.

The spelling of 1229156923 in words is "one billion, two hundred twenty-nine million, one hundred fifty-six thousand, nine hundred twenty-three".