161965294 has 4 divisors (see below), whose sum is σ = 242947944. Its totient is φ = 80982646.

The previous prime is 161965289. The next prime is 161965301. The reversal of 161965294 is 492569161.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 161965294.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40491322 + ... + 40491325.

It is an arithmetic number, because the mean of its divisors is an integer number (60736986).

Almost surely, 2^161965294 is an apocalyptic number.

161965294 is a deficient number, since it is larger than the sum of its proper divisors (80982650).

161965294 is an equidigital number, since it uses as much as digits as its factorization.

161965294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80982649.

The product of its digits is 116640, while the sum is 43.

The square root of 161965294 is about 12726.5586078877. The cubic root of 161965294 is about 545.0972460648.

The spelling of 161965294 in words is "one hundred sixty-one million, nine hundred sixty-five thousand, two hundred ninety-four".