161917267 has 4 divisors (see below), whose sum is σ = 161943400. Its totient is φ = 161891136.

The previous prime is 161917243. The next prime is 161917271. The reversal of 161917267 is 762719161.

161917267 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 is a cyclic number.

It is not a de Polignac number, because 161917267 - 2²³ = 153528659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161917277) 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, 2083 + ... + 18115.

It is an arithmetic number, because the mean of its divisors is an integer number (40485850).

Almost surely, 2^161917267 is an apocalyptic number.

161917267 is a deficient number, since it is larger than the sum of its proper divisors (26133).

161917267 is a wasteful number, since it uses less digits than its factorization.

161917267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26132.

The product of its digits is 31752, while the sum is 40.

The square root of 161917267 is about 12724.6715871177. The cubic root of 161917267 is about 545.0433621476.

The spelling of 161917267 in words is "one hundred sixty-one million, nine hundred seventeen thousand, two hundred sixty-seven".