1297632921 has 8 divisors (see below), whose sum is σ = 1863267840. Its totient is φ = 798543312.

The previous prime is 1297632881. The next prime is 1297632989. The reversal of 1297632921 is 1292367921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1297632921 - 2⁶ = 1297632857 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1297630921) 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, 16636281 + ... + 16636358.

It is an arithmetic number, because the mean of its divisors is an integer number (232908480).

Almost surely, 2^1297632921 is an apocalyptic number.

It is an amenable number.

1297632921 is a deficient number, since it is larger than the sum of its proper divisors (565634919).

1297632921 is a wasteful number, since it uses less digits than its factorization.

1297632921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33272655.

The product of its digits is 81648, while the sum is 42.

The square root of 1297632921 is about 36022.6723189716. The cubic root of 1297632921 is about 1090.7300669720.

The spelling of 1297632921 in words is "one billion, two hundred ninety-seven million, six hundred thirty-two thousand, nine hundred twenty-one".