161894836 has 6 divisors (see below), whose sum is σ = 283315970. Its totient is φ = 80947416.

The previous prime is 161894833. The next prime is 161894867. The reversal of 161894836 is 638498161.

It can be written as a sum of positive squares in only one way, i.e., 120033936 + 41860900 = 10956^2 + 6470^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161894833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20236851 + ... + 20236858.

Almost surely, 2^161894836 is an apocalyptic number.

It is an amenable number.

161894836 is a deficient number, since it is larger than the sum of its proper divisors (121421134).

161894836 is a wasteful number, since it uses less digits than its factorization.

161894836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40473713 (or 40473711 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 161894836 is about 12723.7901585966. The cubic root of 161894836 is about 545.0181920252.

It can be divided in two parts, 16189 and 4836, that added together give a square (21025 = 145²).

The spelling of 161894836 in words is "one hundred sixty-one million, eight hundred ninety-four thousand, eight hundred thirty-six".