161913933 has 24 divisors (see below), whose sum is σ = 248162616. Its totient is φ = 101376000.

The previous prime is 161913923. The next prime is 161913937. The reversal of 161913933 is 339319161.

161913933 is a `hidden beast` number, since 1 + 619 + 1 + 3 + 9 + 33 = 666.

161913933 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 123943689 + 37970244 = 11133^2 + 6162^2 .

It is not a de Polignac number, because 161913933 - 2⁸ = 161913677 is a prime.

It is a super-2 number, since 2×161913933² = 52432243399056978, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161913937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100333 + ... + 101933.

It is an arithmetic number, because the mean of its divisors is an integer number (10340109).

Almost surely, 2^161913933 is an apocalyptic number.

It is an amenable number.

161913933 is a deficient number, since it is larger than the sum of its proper divisors (86248683).

161913933 is a wasteful number, since it uses less digits than its factorization.

161913933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285 (or 2282 counting only the distinct ones).

The product of its digits is 13122, while the sum is 36.

The square root of 161913933 is about 12724.5405810976. The cubic root of 161913933 is about 545.0396211691.

The spelling of 161913933 in words is "one hundred sixty-one million, nine hundred thirteen thousand, nine hundred thirty-three".