1272291965 has 16 divisors (see below), whose sum is σ = 1836693120. Its totient is φ = 826511040.

The previous prime is 1272291959. The next prime is 1272291967. The reversal of 1272291965 is 5691922721.

It is not a de Polignac number, because 1272291965 - 2⁴ = 1272291949 is a prime.

It is a super-2 number, since 2×1272291965² = 3237453688407122450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272291967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 955946 + ... + 957275.

It is an arithmetic number, because the mean of its divisors is an integer number (114793320).

Almost surely, 2^1272291965 is an apocalyptic number.

It is an amenable number.

1272291965 is a deficient number, since it is larger than the sum of its proper divisors (564401155).

1272291965 is a wasteful number, since it uses less digits than its factorization.

1272291965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913252.

The product of its digits is 136080, while the sum is 44.

The square root of 1272291965 is about 35669.2019114530. The cubic root of 1272291965 is about 1083.5831960681.

The spelling of 1272291965 in words is "one billion, two hundred seventy-two million, two hundred ninety-one thousand, nine hundred sixty-five".