129742519 has 2 divisors, whose sum is σ = 129742520. Its totient is φ = 129742518.

The previous prime is 129742511. The next prime is 129742553. The reversal of 129742519 is 915247921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129742519 - 2³ = 129742511 is a prime.

It is a super-2 number, since 2×129742519² = 33666242472930722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129742511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64871259 + 64871260.

It is an arithmetic number, because the mean of its divisors is an integer number (64871260).

Almost surely, 2^129742519 is an apocalyptic number.

129742519 is a deficient number, since it is larger than the sum of its proper divisors (1).

129742519 is an equidigital number, since it uses as much as digits as its factorization.

129742519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 129742519 is about 11390.4573657075. The cubic root of 129742519 is about 506.2450330458.

The spelling of 129742519 in words is "one hundred twenty-nine million, seven hundred forty-two thousand, five hundred nineteen".