161893012 has 6 divisors (see below), whose sum is σ = 283312778. Its totient is φ = 80946504.

The previous prime is 161893009. The next prime is 161893087. The reversal of 161893012 is 210398161.

It can be written as a sum of positive squares in only one way, i.e., 84382596 + 77510416 = 9186^2 + 8804^2 .

It is a super-3 number, since 3×161893012³ (a number of 26 digits) contains 333 as substring.

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, 20236623 + ... + 20236630.

Almost surely, 2^161893012 is an apocalyptic number.

It is an amenable number.

161893012 is a deficient number, since it is larger than the sum of its proper divisors (121419766).

161893012 is a wasteful number, since it uses less digits than its factorization.

161893012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40473257 (or 40473255 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 161893012 is about 12723.7184816389. The cubic root of 161893012 is about 545.0161451885.

The spelling of 161893012 in words is "one hundred sixty-one million, eight hundred ninety-three thousand, twelve".