129056461 has 4 divisors (see below), whose sum is σ = 129321952. Its totient is φ = 128790972.

The previous prime is 129056449. The next prime is 129056507. The reversal of 129056461 is 164650921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 164650921 = 139 ⋅1184539.

It is a cyclic number.

It is not a de Polignac number, because 129056461 - 2⁵ = 129056429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129056261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132015 + ... + 132988.

It is an arithmetic number, because the mean of its divisors is an integer number (32330488).

Almost surely, 2^129056461 is an apocalyptic number.

It is an amenable number.

129056461 is a deficient number, since it is larger than the sum of its proper divisors (265491).

129056461 is an equidigital number, since it uses as much as digits as its factorization.

129056461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265490.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 129056461 is about 11360.3019766202. The cubic root of 129056461 is about 505.3511409434.

The spelling of 129056461 in words is "one hundred twenty-nine million, fifty-six thousand, four hundred sixty-one".