129465109 has 8 divisors (see below), whose sum is σ = 133277400. Its totient is φ = 125669376.

The previous prime is 129465097. The next prime is 129465173. The reversal of 129465109 is 901564921.

It can be written as a sum of positive squares in 4 ways, for example, as 90440100 + 39025009 = 9510^2 + 6247^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129465109 - 2⁷ = 129464981 is a prime.

It is a super-2 number, since 2×129465109² = 33522428896763762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129465199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12717 + ... + 20509.

It is an arithmetic number, because the mean of its divisors is an integer number (16659675).

Almost surely, 2^129465109 is an apocalyptic number.

It is an amenable number.

129465109 is a deficient number, since it is larger than the sum of its proper divisors (3812291).

129465109 is an equidigital number, since it uses as much as digits as its factorization.

129465109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8279.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 129465109 is about 11378.2735509391. The cubic root of 129465109 is about 505.8839649672.

The spelling of 129465109 in words is "one hundred twenty-nine million, four hundred sixty-five thousand, one hundred nine".