161297115 has 32 divisors (see below), whose sum is σ = 299790336. Its totient is φ = 72524160.

The previous prime is 161297113. The next prime is 161297131. The reversal of 161297115 is 511792161.

161297115 = T₁₃₆ + T₁₃₇ + ... + T₉₈₉.

It is not a de Polignac number, because 161297115 - 2¹ = 161297113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161297113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6187 + ... + 18996.

It is an arithmetic number, because the mean of its divisors is an integer number (9368448).

Almost surely, 2^161297115 is an apocalyptic number.

161297115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161297115 is a deficient number, since it is larger than the sum of its proper divisors (138493221).

161297115 is a wasteful number, since it uses less digits than its factorization.

161297115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25259.

The product of its digits is 3780, while the sum is 33.

The square root of 161297115 is about 12700.2801150211. The cubic root of 161297115 is about 544.3466232309.

The spelling of 161297115 in words is "one hundred sixty-one million, two hundred ninety-seven thousand, one hundred fifteen".