1297512656 has 40 divisors (see below), whose sum is σ = 2744985024. Its totient is φ = 589237760.

The previous prime is 1297512653. The next prime is 1297512677. The reversal of 1297512656 is 6562157921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297512653) 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, 237896 + ... + 243288.

Almost surely, 2^1297512656 is an apocalyptic number.

1297512656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1297512656 is an abundant number, since it is smaller than the sum of its proper divisors (1447472368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1297512656 is a wasteful number, since it uses less digits than its factorization.

1297512656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779 (or 6773 counting only the distinct ones).

The product of its digits is 226800, while the sum is 44.

The square root of 1297512656 is about 36021.0029843701. The cubic root of 1297512656 is about 1090.6963695366.

The spelling of 1297512656 in words is "one billion, two hundred ninety-seven million, five hundred twelve thousand, six hundred fifty-six".