129192823 has 2 divisors, whose sum is σ = 129192824. Its totient is φ = 129192822.

The previous prime is 129192803. The next prime is 129192827. The reversal of 129192823 is 328291921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129192823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129192827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64596411 + 64596412.

It is an arithmetic number, because the mean of its divisors is an integer number (64596412).

Almost surely, 2^129192823 is an apocalyptic number.

129192823 is a deficient number, since it is larger than the sum of its proper divisors (1).

129192823 is an equidigital number, since it uses as much as digits as its factorization.

129192823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 129192823 is about 11366.3020811520. The cubic root of 129192823 is about 505.5290641962.

The spelling of 129192823 in words is "one hundred twenty-nine million, one hundred ninety-two thousand, eight hundred twenty-three".