161886297 has 4 divisors (see below), whose sum is σ = 215848400. Its totient is φ = 107924196.

The previous prime is 161886239. The next prime is 161886313. The reversal of 161886297 is 792688161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 792688161 = 3 ⋅264229387.

It is not a de Polignac number, because 161886297 - 2⁷ = 161886169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161886217) 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, 26981047 + ... + 26981052.

It is an arithmetic number, because the mean of its divisors is an integer number (53962100).

Almost surely, 2^161886297 is an apocalyptic number.

It is an amenable number.

161886297 is a deficient number, since it is larger than the sum of its proper divisors (53962103).

161886297 is an equidigital number, since it uses as much as digits as its factorization.

161886297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53962102.

The product of its digits is 290304, while the sum is 48.

The square root of 161886297 is about 12723.4546016402. The cubic root of 161886297 is about 545.0086096892.

The spelling of 161886297 in words is "one hundred sixty-one million, eight hundred eighty-six thousand, two hundred ninety-seven".