161890533 has 12 divisors (see below), whose sum is σ = 267247968. Its totient is φ = 92508840.

The previous prime is 161890493. The next prime is 161890543. The reversal of 161890533 is 335098161.

It is a happy number.

161890533 is a `hidden beast` number, since 1 + 618 + 9 + 0 + 5 + 33 = 666.

It is not a de Polignac number, because 161890533 - 2¹⁷ = 161759461 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161890543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1284783 + ... + 1284908.

It is an arithmetic number, because the mean of its divisors is an integer number (22270664).

Almost surely, 2^161890533 is an apocalyptic number.

It is an amenable number.

161890533 is a deficient number, since it is larger than the sum of its proper divisors (105357435).

161890533 is a wasteful number, since it uses less digits than its factorization.

161890533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569704 (or 2569701 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 161890533 is about 12723.6210647755. The cubic root of 161890533 is about 545.0133633061.

The spelling of 161890533 in words is "one hundred sixty-one million, eight hundred ninety thousand, five hundred thirty-three".