1271657965 has 16 divisors (see below), whose sum is σ = 1538519616. Its totient is φ = 1009008000.

The previous prime is 1271657939. The next prime is 1271657969. The reversal of 1271657965 is 5697561721.

It is not a de Polignac number, because 1271657965 - 2⁷ = 1271657837 is a prime.

It is a super-4 number, since 4×1271657965⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271657969) 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, 328290 + ... + 332140.

It is an arithmetic number, because the mean of its divisors is an integer number (96157476).

Almost surely, 2^1271657965 is an apocalyptic number.

It is an amenable number.

1271657965 is a deficient number, since it is larger than the sum of its proper divisors (266861651).

1271657965 is a wasteful number, since it uses less digits than its factorization.

1271657965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380.

The product of its digits is 793800, while the sum is 49.

The square root of 1271657965 is about 35660.3135852729. The cubic root of 1271657965 is about 1083.4031781924.

The spelling of 1271657965 in words is "one billion, two hundred seventy-one million, six hundred fifty-seven thousand, nine hundred sixty-five".