1295978017 has 12 divisors (see below), whose sum is σ = 1381751740. Its totient is φ = 1215265536.

The previous prime is 1295977967. The next prime is 1295978053. The reversal of 1295978017 is 7108795921.

It can be written as a sum of positive squares in 6 ways, for example, as 14409616 + 1281568401 = 3796^2 + 35799^2 .

It is not a de Polignac number, because 1295978017 - 2²³ = 1287589409 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1295978077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71959 + ... + 88147.

Almost surely, 2^1295978017 is an apocalyptic number.

1295978017 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1295978017 is a deficient number, since it is larger than the sum of its proper divisors (85773723).

1295978017 is a wasteful number, since it uses less digits than its factorization.

1295978017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16500 (or 16483 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 49.

The square root of 1295978017 is about 35999.6946792608. The cubic root of 1295978017 is about 1090.2661911950.

The spelling of 1295978017 in words is "one billion, two hundred ninety-five million, nine hundred seventy-eight thousand, seventeen".