199581425 has 6 divisors (see below), whose sum is σ = 247480998. Its totient is φ = 159665120.

The previous prime is 199581401. The next prime is 199581433. The reversal of 199581425 is 524185991.

It can be written as a sum of positive squares in 3 ways, for example, as 65739664 + 133841761 = 8108^2 + 11569^2 .

It is not a de Polignac number, because 199581425 - 2⁸ = 199581169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3991604 + ... + 3991653.

It is an arithmetic number, because the mean of its divisors is an integer number (41246833).

Almost surely, 2^199581425 is an apocalyptic number.

It is an amenable number.

199581425 is a deficient number, since it is larger than the sum of its proper divisors (47899573).

199581425 is an equidigital number, since it uses as much as digits as its factorization.

199581425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7983267 (or 7983262 counting only the distinct ones).

The product of its digits is 129600, while the sum is 44.

The square root of 199581425 is about 14127.3290115294. The cubic root of 199581425 is about 584.3952891237.

The spelling of 199581425 in words is "one hundred ninety-nine million, five hundred eighty-one thousand, four hundred twenty-five".