129140299 has 4 divisors (see below), whose sum is σ = 129327880. Its totient is φ = 128952720.

The previous prime is 129140269. The next prime is 129140303. The reversal of 129140299 is 992041921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 992041921 = 13 ⋅76310917.

It is a cyclic number.

It is not a de Polignac number, because 129140299 - 2¹⁷ = 129009227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129140269) 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, 92754 + ... + 94135.

It is an arithmetic number, because the mean of its divisors is an integer number (32331970).

Almost surely, 2^129140299 is an apocalyptic number.

129140299 is a deficient number, since it is larger than the sum of its proper divisors (187581).

129140299 is an equidigital number, since it uses as much as digits as its factorization.

129140299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187580.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 129140299 is about 11363.9913322741. The cubic root of 129140299 is about 505.4605464382.

The spelling of 129140299 in words is "one hundred twenty-nine million, one hundred forty thousand, two hundred ninety-nine".