161297815 has 32 divisors (see below), whose sum is σ = 228147840. Its totient is φ = 107188224.

The previous prime is 161297803. The next prime is 161297849. The reversal of 161297815 is 518792161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 161297815 - 2¹⁷ = 161166743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164607 + ... + 165583.

It is an arithmetic number, because the mean of its divisors is an integer number (7129620).

Almost surely, 2^161297815 is an apocalyptic number.

161297815 is a deficient number, since it is larger than the sum of its proper divisors (66850025).

161297815 is an equidigital number, since it uses as much as digits as its factorization.

161297815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131.

The product of its digits is 30240, while the sum is 40.

The square root of 161297815 is about 12700.3076734385. The cubic root of 161297815 is about 544.3474106847.

The spelling of 161297815 in words is "one hundred sixty-one million, two hundred ninety-seven thousand, eight hundred fifteen".