161297995 has 4 divisors (see below), whose sum is σ = 193557600. Its totient is φ = 129038392.

The previous prime is 161297987. The next prime is 161297999. The reversal of 161297995 is 599792161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 599792161 = 6899 ⋅86939.

It is a cyclic number.

It is not a de Polignac number, because 161297995 - 2³ = 161297987 is a prime.

It is a Smith number, since the sum of its digits (49) 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 (161297999) 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, 16129795 + ... + 16129804.

It is an arithmetic number, because the mean of its divisors is an integer number (48389400).

Almost surely, 2^161297995 is an apocalyptic number.

161297995 is a deficient number, since it is larger than the sum of its proper divisors (32259605).

161297995 is an equidigital number, since it uses as much as digits as its factorization.

161297995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32259604.

The product of its digits is 306180, while the sum is 49.

The square root of 161297995 is about 12700.3147598790. The cubic root of 161297995 is about 544.3476131725.

The spelling of 161297995 in words is "one hundred sixty-one million, two hundred ninety-seven thousand, nine hundred ninety-five".