129077457 has 4 divisors (see below), whose sum is σ = 172103280. Its totient is φ = 86051636.

The previous prime is 129077411. The next prime is 129077467. The reversal of 129077457 is 754770921.

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 129077457 - 2⁷ = 129077329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129077467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21512907 + ... + 21512912.

It is an arithmetic number, because the mean of its divisors is an integer number (43025820).

Almost surely, 2^129077457 is an apocalyptic number.

It is an amenable number.

129077457 is a deficient number, since it is larger than the sum of its proper divisors (43025823).

129077457 is an equidigital number, since it uses as much as digits as its factorization.

129077457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43025822.

The product of its (nonzero) digits is 123480, while the sum is 42.

The square root of 129077457 is about 11361.2260341919. The cubic root of 129077457 is about 505.3785443944.

The spelling of 129077457 in words is "one hundred twenty-nine million, seventy-seven thousand, four hundred fifty-seven".