129745457 has 4 divisors (see below), whose sum is σ = 129768960. Its totient is φ = 129721956.

The previous prime is 129745423. The next prime is 129745493. The reversal of 129745457 is 754547921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129745457 - 2⁶ = 129745393 is a prime.

It is a super-2 number, since 2×129745457² = 33667767224277698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129745417) 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, 1544 + ... + 16182.

It is an arithmetic number, because the mean of its divisors is an integer number (32442240).

Almost surely, 2^129745457 is an apocalyptic number.

It is an amenable number.

129745457 is a deficient number, since it is larger than the sum of its proper divisors (23503).

129745457 is an equidigital number, since it uses as much as digits as its factorization.

129745457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23502.

The product of its digits is 352800, while the sum is 44.

The square root of 129745457 is about 11390.5863325818. The cubic root of 129745457 is about 506.2488542981.

The spelling of 129745457 in words is "one hundred twenty-nine million, seven hundred forty-five thousand, four hundred fifty-seven".