1297121929 has 4 divisors (see below), whose sum is σ = 1297507840. Its totient is φ = 1296736020.

The previous prime is 1297121897. The next prime is 1297121939. The reversal of 1297121929 is 9291217921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1297121929 - 2⁵ = 1297121897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1297121939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187869 + ... + 194650.

It is an arithmetic number, because the mean of its divisors is an integer number (324376960).

Almost surely, 2^1297121929 is an apocalyptic number.

It is an amenable number.

1297121929 is a deficient number, since it is larger than the sum of its proper divisors (385911).

1297121929 is an equidigital number, since it uses as much as digits as its factorization.

1297121929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385910.

The product of its digits is 40824, while the sum is 43.

The square root of 1297121929 is about 36015.5789763263. The cubic root of 1297121929 is about 1090.5868761139.

The spelling of 1297121929 in words is "one billion, two hundred ninety-seven million, one hundred twenty-one thousand, nine hundred twenty-nine".