190609645 has 4 divisors (see below), whose sum is σ = 228731580. Its totient is φ = 152487712.

The previous prime is 190609633. The next prime is 190609667. The reversal of 190609645 is 546906091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546906091 = 18451 ⋅29641.

It can be written as a sum of positive squares in 2 ways, for example, as 38975049 + 151634596 = 6243^2 + 12314^2 .

It is a cyclic number.

It is not a de Polignac number, because 190609645 - 2¹¹ = 190607597 is a prime.

It is a super-3 number, since 3×190609645³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 190609598 and 190609607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19060960 + ... + 19060969.

It is an arithmetic number, because the mean of its divisors is an integer number (57182895).

Almost surely, 2^190609645 is an apocalyptic number.

It is an amenable number.

190609645 is a deficient number, since it is larger than the sum of its proper divisors (38121935).

190609645 is an equidigital number, since it uses as much as digits as its factorization.

190609645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38121934.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 190609645 is about 13806.1451897334. The cubic root of 190609645 is about 575.5039262233.

The spelling of 190609645 in words is "one hundred ninety million, six hundred nine thousand, six hundred forty-five".