190125809 has 4 divisors (see below), whose sum is σ = 190250100. Its totient is φ = 190001520.

The previous prime is 190125779. The next prime is 190125829. The reversal of 190125809 is 908521091.

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 123654400 + 66471409 = 11120^2 + 8153^2 .

It is a cyclic number.

It is not a de Polignac number, because 190125809 - 2¹² = 190121713 is a prime.

It is a super-2 number, since 2×190125809² = 72295646495808962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190125829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59822 + ... + 62919.

It is an arithmetic number, because the mean of its divisors is an integer number (47562525).

Almost surely, 2^190125809 is an apocalyptic number.

It is an amenable number.

190125809 is a deficient number, since it is larger than the sum of its proper divisors (124291).

190125809 is a wasteful number, since it uses less digits than its factorization.

190125809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124290.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 190125809 is about 13788.6115689724. The cubic root of 190125809 is about 575.0165681426.

The spelling of 190125809 in words is "one hundred ninety million, one hundred twenty-five thousand, eight hundred nine".