129506761 has 4 divisors (see below), whose sum is σ = 132262272. Its totient is φ = 126751252.

The previous prime is 129506753. The next prime is 129506789. The reversal of 129506761 is 167605921.

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 129506761 - 2³ = 129506753 is a prime.

It is a super-2 number, since 2×129506761² = 33544002289422242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129506761.

It is not an unprimeable number, because it can be changed into a prime (129504761) 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, 1377685 + ... + 1377778.

It is an arithmetic number, because the mean of its divisors is an integer number (33065568).

Almost surely, 2^129506761 is an apocalyptic number.

It is an amenable number.

129506761 is a deficient number, since it is larger than the sum of its proper divisors (2755511).

129506761 is an equidigital number, since it uses as much as digits as its factorization.

129506761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2755510.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 129506761 is about 11380.1037341494. The cubic root of 129506761 is about 505.9382107785.

The spelling of 129506761 in words is "one hundred twenty-nine million, five hundred six thousand, seven hundred sixty-one".