129858623 has 2 divisors, whose sum is σ = 129858624. Its totient is φ = 129858622.

The previous prime is 129858613. The next prime is 129858647. The reversal of 129858623 is 326858921.

It is a weak prime.

It is an emirp because it is prime and its reverse (326858921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129858623 - 2⁸ = 129858367 is a prime.

It is a super-2 number, since 2×129858623² = 33726523934912258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129858613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64929311 + 64929312.

It is an arithmetic number, because the mean of its divisors is an integer number (64929312).

Almost surely, 2^129858623 is an apocalyptic number.

129858623 is a deficient number, since it is larger than the sum of its proper divisors (1).

129858623 is an equidigital number, since it uses as much as digits as its factorization.

129858623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 129858623 is about 11395.5527729022. The cubic root of 129858623 is about 506.3959975604.

The spelling of 129858623 in words is "one hundred twenty-nine million, eight hundred fifty-eight thousand, six hundred twenty-three".