129242719 has 2 divisors, whose sum is σ = 129242720. Its totient is φ = 129242718.

The previous prime is 129242699. The next prime is 129242723. The reversal of 129242719 is 917242921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129242719 - 2⁹ = 129242207 is a prime.

It is a super-2 number, since 2×129242719² = 33407360829025922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129242759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64621359 + 64621360.

It is an arithmetic number, because the mean of its divisors is an integer number (64621360).

Almost surely, 2^129242719 is an apocalyptic number.

129242719 is a deficient number, since it is larger than the sum of its proper divisors (1).

129242719 is an equidigital number, since it uses as much as digits as its factorization.

129242719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 129242719 is about 11368.4967783784. The cubic root of 129242719 is about 505.5941365199.

The spelling of 129242719 in words is "one hundred twenty-nine million, two hundred forty-two thousand, seven hundred nineteen".