1289126265 has 16 divisors (see below), whose sum is σ = 2357259648. Its totient is φ = 589314816.

The previous prime is 1289126257. The next prime is 1289126291. The reversal of 1289126265 is 5626219821.

It is not a de Polignac number, because 1289126265 - 2³ = 1289126257 is a prime.

It is a super-2 number, since 2×1289126265² = 3323693054225700450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6138592 + ... + 6138801.

It is an arithmetic number, because the mean of its divisors is an integer number (147328728).

Almost surely, 2^1289126265 is an apocalyptic number.

1289126265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1289126265 is a deficient number, since it is larger than the sum of its proper divisors (1068133383).

1289126265 is a wasteful number, since it uses less digits than its factorization.

1289126265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12277408.

The product of its digits is 103680, while the sum is 42.

The square root of 1289126265 is about 35904.4045348200. The cubic root of 1289126265 is about 1088.3414061696.

The spelling of 1289126265 in words is "one billion, two hundred eighty-nine million, one hundred twenty-six thousand, two hundred sixty-five".