161722136 has 8 divisors (see below), whose sum is σ = 303229020. Its totient is φ = 80861064.

The previous prime is 161722117. The next prime is 161722157. The reversal of 161722136 is 631227161.

161722136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 161722099 and 161722108.

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, 10107626 + ... + 10107641.

Almost surely, 2^161722136 is an apocalyptic number.

It is an amenable number.

161722136 is a deficient number, since it is larger than the sum of its proper divisors (141506884).

161722136 is a wasteful number, since it uses less digits than its factorization.

161722136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20215273 (or 20215269 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 161722136 is about 12717.0018479200. The cubic root of 161722136 is about 544.8243251653.

Adding to 161722136 its reverse (631227161), we get a palindrome (792949297).

It can be divided in two parts, 16 and 1722136, that multiplied together give a triangular number (27554176 = T₇₄₂₃).

The spelling of 161722136 in words is "one hundred sixty-one million, seven hundred twenty-two thousand, one hundred thirty-six".