190820225 has 6 divisors (see below), whose sum is σ = 236617110. Its totient is φ = 152656160.

The previous prime is 190820153. The next prime is 190820297. The reversal of 190820225 is 522028091.

It is an interprime number because it is at equal distance from previous prime (190820153) and next prime (190820297).

It can be written as a sum of positive squares in 3 ways, for example, as 2334784 + 188485441 = 1528^2 + 13729^2 .

It is not a de Polignac number, because 190820225 - 2⁸ = 190819969 is a prime.

It is a Curzon 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 5 ways as a sum of consecutive naturals, for example, 3816380 + ... + 3816429.

It is an arithmetic number, because the mean of its divisors is an integer number (39436185).

Almost surely, 2^190820225 is an apocalyptic number.

It is an amenable number.

190820225 is a deficient number, since it is larger than the sum of its proper divisors (45796885).

190820225 is an equidigital number, since it uses as much as digits as its factorization.

190820225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7632819 (or 7632814 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 190820225 is about 13813.7693986833. The cubic root of 190820225 is about 575.7157815664.

The spelling of 190820225 in words is "one hundred ninety million, eight hundred twenty thousand, two hundred twenty-five".