161903286 has 40 divisors (see below), whose sum is σ = 367184664. Its totient is φ = 53313120.

The previous prime is 161903263. The next prime is 161903321. The reversal of 161903286 is 682309161.

161903286 is a `hidden beast` number, since 1 + 619 + 0 + 32 + 8 + 6 = 666.

161903286 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161903286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7426 + ... + 19466.

Almost surely, 2^161903286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161903286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183592332).

161903286 is an abundant number, since it is smaller than the sum of its proper divisors (205281378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161903286 is a wasteful number, since it uses less digits than its factorization.

161903286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12138 (or 12129 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 161903286 is about 12724.1222094100. The cubic root of 161903286 is about 545.0276741551.

The spelling of 161903286 in words is "one hundred sixty-one million, nine hundred three thousand, two hundred eighty-six".