161003785 has 4 divisors (see below), whose sum is σ = 193204548. Its totient is φ = 128803024.

The previous prime is 161003779. The next prime is 161003803. The reversal of 161003785 is 587300161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23551609 + 137452176 = 4853^2 + 11724^2 .

It is a cyclic number.

It is not a de Polignac number, because 161003785 - 2²⁵ = 127449353 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16100374 + ... + 16100383.

It is an arithmetic number, because the mean of its divisors is an integer number (48301137).

Almost surely, 2^161003785 is an apocalyptic number.

It is an amenable number.

161003785 is a deficient number, since it is larger than the sum of its proper divisors (32200763).

161003785 is an equidigital number, since it uses as much as digits as its factorization.

161003785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32200762.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 161003785 is about 12688.7266894673. The cubic root of 161003785 is about 544.0164456263.

The spelling of 161003785 in words is "one hundred sixty-one million, three thousand, seven hundred eighty-five".