129813623 has 2 divisors, whose sum is σ = 129813624. Its totient is φ = 129813622.

The previous prime is 129813601. The next prime is 129813641. The reversal of 129813623 is 326318921.

It is a strong prime.

It is an emirp because it is prime and its reverse (326318921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129813623 - 2⁶ = 129813559 is a prime.

It is a super-2 number, since 2×129813623² = 33703153432772258, which contains 22 as substring.

It is equal to p_7368308 and since 129813623 and 7368308 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129813653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64906811 + 64906812.

It is an arithmetic number, because the mean of its divisors is an integer number (64906812).

Almost surely, 2^129813623 is an apocalyptic number.

129813623 is a deficient number, since it is larger than the sum of its proper divisors (1).

129813623 is an equidigital number, since it uses as much as digits as its factorization.

129813623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 129813623 is about 11393.5781473600. The cubic root of 129813623 is about 506.3374968820.

It can be divided in two parts, 1298136 and 23, that multiplied together give a triangular number (29857128 = T₇₇₂₇).

The spelling of 129813623 in words is "one hundred twenty-nine million, eight hundred thirteen thousand, six hundred twenty-three".