129923141 has 4 divisors (see below), whose sum is σ = 129970092. Its totient is φ = 129876192.

The previous prime is 129923119. The next prime is 129923147. The reversal of 129923141 is 141329921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69239041 + 60684100 = 8321^2 + 7790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129923141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129923098 and 129923107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129923147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19046 + ... + 24951.

It is an arithmetic number, because the mean of its divisors is an integer number (32492523).

Almost surely, 2^129923141 is an apocalyptic number.

It is an amenable number.

129923141 is a deficient number, since it is larger than the sum of its proper divisors (46951).

129923141 is an equidigital number, since it uses as much as digits as its factorization.

129923141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46950.

The product of its digits is 3888, while the sum is 32.

The square root of 129923141 is about 11398.3832625509. The cubic root of 129923141 is about 506.4798483589.

The spelling of 129923141 in words is "one hundred twenty-nine million, nine hundred twenty-three thousand, one hundred forty-one".