129011965 has 4 divisors (see below), whose sum is σ = 154814364. Its totient is φ = 103209568.

The previous prime is 129011947. The next prime is 129011999. The reversal of 129011965 is 569110921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15077689 + 113934276 = 3883^2 + 10674^2 .

It is a cyclic number.

It is not a de Polignac number, because 129011965 - 2¹¹ = 129009917 is a prime.

It is a super-2 number, since 2×129011965² = 33288174226322450, 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 129011965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12901192 + ... + 12901201.

It is an arithmetic number, because the mean of its divisors is an integer number (38703591).

Almost surely, 2^129011965 is an apocalyptic number.

It is an amenable number.

129011965 is a deficient number, since it is larger than the sum of its proper divisors (25802399).

129011965 is an equidigital number, since it uses as much as digits as its factorization.

129011965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25802398.

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 129011965 is about 11358.3434091420. The cubic root of 129011965 is about 505.2930560583.

The spelling of 129011965 in words is "one hundred twenty-nine million, eleven thousand, nine hundred sixty-five".