1296661897 has 16 divisors (see below), whose sum is σ = 1397664000. Its totient is φ = 1199076480.

The previous prime is 1296661879. The next prime is 1296661943. The reversal of 1296661897 is 7981666921.

It is a cyclic number.

It is not a de Polignac number, because 1296661897 - 2¹¹ = 1296659849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1296661097) 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, 374229 + ... + 377677.

It is an arithmetic number, because the mean of its divisors is an integer number (87354000).

Almost surely, 2^1296661897 is an apocalyptic number.

It is an amenable number.

1296661897 is a deficient number, since it is larger than the sum of its proper divisors (101002103).

1296661897 is a wasteful number, since it uses less digits than its factorization.

1296661897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936.

The product of its digits is 1959552, while the sum is 55.

The square root of 1296661897 is about 36009.1918404176. The cubic root of 1296661897 is about 1090.4579331638.

The spelling of 1296661897 in words is "one billion, two hundred ninety-six million, six hundred sixty-one thousand, eight hundred ninety-seven".