161810386 has 8 divisors (see below), whose sum is σ = 256993020. Its totient is φ = 76146048.

The previous prime is 161810371. The next prime is 161810393. The reversal of 161810386 is 683018161.

It can be written as a sum of positive squares in 2 ways, for example, as 156725361 + 5085025 = 12519^2 + 2255^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 4759129 = 161810386 / (1 + 6 + 1 + 8 + 1 + 0 + 3 + 8 + 6).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2379531 + ... + 2379598.

Almost surely, 2^161810386 is an apocalyptic number.

161810386 is a deficient number, since it is larger than the sum of its proper divisors (95182634).

161810386 is a wasteful number, since it uses less digits than its factorization.

161810386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4759148.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 161810386 is about 12720.4711390734. The cubic root of 161810386 is about 544.9234087020.

The spelling of 161810386 in words is "one hundred sixty-one million, eight hundred ten thousand, three hundred eighty-six".