1297121767 has 4 divisors (see below), whose sum is σ = 1301266240. Its totient is φ = 1292977296.

The previous prime is 1297121713. The next prime is 1297121779. The reversal of 1297121767 is 7671217921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1297121767 - 2¹⁵ = 1297088999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297121167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2071767 + ... + 2072392.

It is an arithmetic number, because the mean of its divisors is an integer number (325316560).

Almost surely, 2^1297121767 is an apocalyptic number.

1297121767 is a deficient number, since it is larger than the sum of its proper divisors (4144473).

1297121767 is an equidigital number, since it uses as much as digits as its factorization.

1297121767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4144472.

The product of its digits is 74088, while the sum is 43.

The square root of 1297121767 is about 36015.5767272995. The cubic root of 1297121767 is about 1090.5868307121.

The spelling of 1297121767 in words is "one billion, two hundred ninety-seven million, one hundred twenty-one thousand, seven hundred sixty-seven".