161197727 has 8 divisors (see below), whose sum is σ = 162856320. Its totient is φ = 159545880.

The previous prime is 161197721. The next prime is 161197739. The reversal of 161197727 is 727791161.

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 161197727 - 2⁴ = 161197711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161197721) 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, 56108 + ... + 58910.

It is an arithmetic number, because the mean of its divisors is an integer number (20357040).

Almost surely, 2^161197727 is an apocalyptic number.

161197727 is a deficient number, since it is larger than the sum of its proper divisors (1658593).

161197727 is a wasteful number, since it uses less digits than its factorization.

161197727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373.

The product of its digits is 37044, while the sum is 41.

The square root of 161197727 is about 12696.3666850009. The cubic root of 161197727 is about 544.2347951549.

The spelling of 161197727 in words is "one hundred sixty-one million, one hundred ninety-seven thousand, seven hundred twenty-seven".