161885813 has 8 divisors (see below), whose sum is σ = 170664960. Its totient is φ = 153329040.

The previous prime is 161885809. The next prime is 161885827. The reversal of 161885813 is 318588161.

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

It is not a de Polignac number, because 161885813 - 2² = 161885809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161885803) 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, 54098 + ... + 57011.

It is an arithmetic number, because the mean of its divisors is an integer number (21333120).

Almost surely, 2^161885813 is an apocalyptic number.

It is an amenable number.

161885813 is a deficient number, since it is larger than the sum of its proper divisors (8779147).

161885813 is a wasteful number, since it uses less digits than its factorization.

161885813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111187.

The product of its digits is 46080, while the sum is 41.

The square root of 161885813 is about 12723.4355816344. The cubic root of 161885813 is about 545.0080665417.

The spelling of 161885813 in words is "one hundred sixty-one million, eight hundred eighty-five thousand, eight hundred thirteen".