161918013 has 8 divisors (see below), whose sum is σ = 228590208. Its totient is φ = 101595584.

The previous prime is 161917969. The next prime is 161918033. The reversal of 161918013 is 310819161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161918013 - 2⁶ = 161917949 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 (161918033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1587381 + ... + 1587482.

It is an arithmetic number, because the mean of its divisors is an integer number (28573776).

Almost surely, 2^161918013 is an apocalyptic number.

It is an amenable number.

161918013 is a deficient number, since it is larger than the sum of its proper divisors (66672195).

161918013 is a wasteful number, since it uses less digits than its factorization.

161918013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174883.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 161918013 is about 12724.7009002177. The cubic root of 161918013 is about 545.0441992041.

The spelling of 161918013 in words is "one hundred sixty-one million, nine hundred eighteen thousand, thirteen".