1797297121 has 4 divisors (see below), whose sum is σ = 1815092244. Its totient is φ = 1779502000.

The previous prime is 1797297097. The next prime is 1797297133. The reversal of 1797297121 is 1217927971.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1752259600 + 45037521 = 41860^2 + 6711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1797297121 - 2⁹ = 1797296609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1797297421) 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, 8897410 + ... + 8897611.

It is an arithmetic number, because the mean of its divisors is an integer number (453773061).

Almost surely, 2^1797297121 is an apocalyptic number.

It is an amenable number.

1797297121 is a deficient number, since it is larger than the sum of its proper divisors (17795123).

1797297121 is a wasteful number, since it uses less digits than its factorization.

1797297121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17795122.

The product of its digits is 111132, while the sum is 46.

The square root of 1797297121 is about 42394.5411698252. The cubic root of 1797297121 is about 1215.8312253587.

The spelling of 1797297121 in words is "one billion, seven hundred ninety-seven million, two hundred ninety-seven thousand, one hundred twenty-one".