129954823 has 2 divisors, whose sum is σ = 129954824. Its totient is φ = 129954822.

The previous prime is 129954743. The next prime is 129954833. The reversal of 129954823 is 328459921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129954823 - 2⁹ = 129954311 is a prime.

It is a super-2 number, since 2×129954823² = 33776512041922658, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129954823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129954833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64977411 + 64977412.

It is an arithmetic number, because the mean of its divisors is an integer number (64977412).

Almost surely, 2^129954823 is an apocalyptic number.

129954823 is a deficient number, since it is larger than the sum of its proper divisors (1).

129954823 is an equidigital number, since it uses as much as digits as its factorization.

129954823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 129954823 is about 11399.7729363352. The cubic root of 129954823 is about 506.5210136979.

The spelling of 129954823 in words is "one hundred twenty-nine million, nine hundred fifty-four thousand, eight hundred twenty-three".