1297733161 has 4 divisors (see below), whose sum is σ = 1297897300. Its totient is φ = 1297569024.

The previous prime is 1297733159. The next prime is 1297733197. The reversal of 1297733161 is 1613377921.

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 76650025 + 1221083136 = 8755^2 + 34944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297733161 - 2¹ = 1297733159 is a prime.

It is a super-2 number, since 2×1297733161² = 3368222714318103842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1297733111) 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, 69576 + ... + 86233.

It is an arithmetic number, because the mean of its divisors is an integer number (324474325).

Almost surely, 2^1297733161 is an apocalyptic number.

It is an amenable number.

1297733161 is a deficient number, since it is larger than the sum of its proper divisors (164139).

1297733161 is an equidigital number, since it uses as much as digits as its factorization.

1297733161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164138.

The product of its digits is 47628, while the sum is 40.

The square root of 1297733161 is about 36024.0636380739. The cubic root of 1297733161 is about 1090.7581519475.

The spelling of 1297733161 in words is "one billion, two hundred ninety-seven million, seven hundred thirty-three thousand, one hundred sixty-one".