190991825 has 12 divisors (see below), whose sum is σ = 244997340. Its totient is φ = 147524160.

The previous prime is 190991789. The next prime is 190991833. The reversal of 190991825 is 528199091.

It is a happy number.

190991825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 3411409 + 187580416 = 1847^2 + 13696^2 .

It is not a de Polignac number, because 190991825 - 2²⁰ = 189943249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130994 + ... + 132443.

It is an arithmetic number, because the mean of its divisors is an integer number (20416445).

Almost surely, 2^190991825 is an apocalyptic number.

It is an amenable number.

190991825 is a deficient number, since it is larger than the sum of its proper divisors (54005515).

190991825 is a wasteful number, since it uses less digits than its factorization.

190991825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263476 (or 263471 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 190991825 is about 13819.9791968006. The cubic root of 190991825 is about 575.8883056073. Note that the first 3 decimals are identical.

The spelling of 190991825 in words is "one hundred ninety million, nine hundred ninety-one thousand, eight hundred twenty-five".