1296137997 has 64 divisors (see below), whose sum is σ = 2413363200. Its totient is φ = 667880640.

The previous prime is 1296137989. The next prime is 1296138017. The reversal of 1296137997 is 7997316921.

It is a happy number.

1296137997 is a `hidden beast` number, since 12 + 9 + 613 + 7 + 9 + 9 + 7 = 666.

It is not a de Polignac number, because 1296137997 - 2³ = 1296137989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296137917) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 261579 + ... + 266487.

It is an arithmetic number, because the mean of its divisors is an integer number (37708800).

Almost surely, 2^1296137997 is an apocalyptic number.

It is an amenable number.

1296137997 is a deficient number, since it is larger than the sum of its proper divisors (1117225203).

1296137997 is a wasteful number, since it uses less digits than its factorization.

1296137997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5063 (or 5057 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 54.

The square root of 1296137997 is about 36001.9165739826. The cubic root of 1296137997 is about 1090.3110514232.

The spelling of 1296137997 in words is "one billion, two hundred ninety-six million, one hundred thirty-seven thousand, nine hundred ninety-seven".