1265880129 has 8 divisors (see below), whose sum is σ = 1787124960. Its totient is φ = 794277696.

The previous prime is 1265880101. The next prime is 1265880151. The reversal of 1265880129 is 9210885621.

It is a happy number.

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

It is not a de Polignac number, because 1265880129 - 2¹⁶ = 1265814593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1265880199) 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, 12410539 + ... + 12410640.

It is an arithmetic number, because the mean of its divisors is an integer number (223390620).

Almost surely, 2^1265880129 is an apocalyptic number.

It is an amenable number.

1265880129 is a deficient number, since it is larger than the sum of its proper divisors (521244831).

1265880129 is a wasteful number, since it uses less digits than its factorization.

1265880129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24821199.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1265880129 is about 35579.2092239274. The cubic root of 1265880129 is about 1081.7598562429.

The spelling of 1265880129 in words is "one billion, two hundred sixty-five million, eight hundred eighty thousand, one hundred twenty-nine".