161173919 has 8 divisors (see below), whose sum is σ = 162408960. Its totient is φ = 159943896.

The previous prime is 161173913. The next prime is 161173921. The reversal of 161173919 is 919371161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161173919 - 2¹² = 161169823 is a prime.

It is a super-2 number, since 2×161173919² = 51954064331637122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161173913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83564 + ... + 85470.

It is an arithmetic number, because the mean of its divisors is an integer number (20301120).

Almost surely, 2^161173919 is an apocalyptic number.

161173919 is a deficient number, since it is larger than the sum of its proper divisors (1235041).

161173919 is a wasteful number, since it uses less digits than its factorization.

161173919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509.

The product of its digits is 10206, while the sum is 38.

The square root of 161173919 is about 12695.4290593111. The cubic root of 161173919 is about 544.2080003603.

The spelling of 161173919 in words is "one hundred sixty-one million, one hundred seventy-three thousand, nine hundred nineteen".