161034921 has 24 divisors (see below), whose sum is σ = 239429736. Its totient is φ = 104232960.

The previous prime is 161034911. The next prime is 161034949. The reversal of 161034921 is 129430161.

161034921 is a `hidden beast` number, since 1 + 610 + 3 + 49 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19900521 + 141134400 = 4461^2 + 11880^2 .

It is not a de Polignac number, because 161034921 - 2⁵ = 161034889 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161034901) 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 in 23 ways as a sum of consecutive naturals, for example, 85041 + ... + 86913.

It is an arithmetic number, because the mean of its divisors is an integer number (9976239).

Almost surely, 2^161034921 is an apocalyptic number.

It is an amenable number.

161034921 is a deficient number, since it is larger than the sum of its proper divisors (78394815).

161034921 is a wasteful number, since it uses less digits than its factorization.

161034921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153 (or 2150 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 161034921 is about 12689.9535460143. The cubic root of 161034921 is about 544.0515118915.

The spelling of 161034921 in words is "one hundred sixty-one million, thirty-four thousand, nine hundred twenty-one".