161372417 has 4 divisors (see below), whose sum is σ = 161398356. Its totient is φ = 161346480.

The previous prime is 161372363. The next prime is 161372459. The reversal of 161372417 is 714273161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 64625521 + 96746896 = 8039^2 + 9836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161372417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161372017) 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, 2567 + ... + 18147.

It is an arithmetic number, because the mean of its divisors is an integer number (40349589).

Almost surely, 2^161372417 is an apocalyptic number.

It is an amenable number.

161372417 is a deficient number, since it is larger than the sum of its proper divisors (25939).

161372417 is a wasteful number, since it uses less digits than its factorization.

161372417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25938.

The product of its digits is 7056, while the sum is 32.

The square root of 161372417 is about 12703.2443493778. The cubic root of 161372417 is about 544.4313199560.

The spelling of 161372417 in words is "one hundred sixty-one million, three hundred seventy-two thousand, four hundred seventeen".