190025509 has 2 divisors, whose sum is σ = 190025510. Its totient is φ = 190025508.

The previous prime is 190025491. The next prime is 190025519. The reversal of 190025509 is 905520091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123276609 + 66748900 = 11103^2 + 8170^2 .

It is a cyclic number.

It is not a de Polignac number, because 190025509 - 2¹⁵ = 189992741 is a prime.

It is a super-2 number, since 2×190025509² = 72219388141418162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190025519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95012754 + 95012755.

It is an arithmetic number, because the mean of its divisors is an integer number (95012755).

Almost surely, 2^190025509 is an apocalyptic number.

It is an amenable number.

190025509 is a deficient number, since it is larger than the sum of its proper divisors (1).

190025509 is an equidigital number, since it uses as much as digits as its factorization.

190025509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 190025509 is about 13784.9740297180. The cubic root of 190025509 is about 574.9154345705.

The spelling of 190025509 in words is "one hundred ninety million, twenty-five thousand, five hundred nine".