161727929 has 4 divisors (see below), whose sum is σ = 176430480. Its totient is φ = 147025380.

The previous prime is 161727901. The next prime is 161727971. The reversal of 161727929 is 929727161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161727929 - 2²⁰ = 160679353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161727929.

It is not an unprimeable number, because it can be changed into a prime (161721929) 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, 7351259 + ... + 7351280.

It is an arithmetic number, because the mean of its divisors is an integer number (44107620).

Almost surely, 2^161727929 is an apocalyptic number.

It is an amenable number.

161727929 is a deficient number, since it is larger than the sum of its proper divisors (14702551).

161727929 is a wasteful number, since it uses less digits than its factorization.

161727929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14702550.

The product of its digits is 95256, while the sum is 44.

The square root of 161727929 is about 12717.2296118298. The cubic root of 161727929 is about 544.8308304170.

The spelling of 161727929 in words is "one hundred sixty-one million, seven hundred twenty-seven thousand, nine hundred twenty-nine".