191000725 has 6 divisors (see below), whose sum is σ = 236840930. Its totient is φ = 152800560.

The previous prime is 191000707. The next prime is 191000741. The reversal of 191000725 is 527000191.

It can be written as a sum of positive squares in 3 ways, for example, as 505521 + 190495204 = 711^2 + 13802^2 .

It is not a de Polignac number, because 191000725 - 2²³ = 182612117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 7640029 = 191000725 / (1 + 9 + 1 + 0 + 0 + 0 + 7 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 191000725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3819990 + ... + 3820039.

Almost surely, 2^191000725 is an apocalyptic number.

It is an amenable number.

191000725 is a deficient number, since it is larger than the sum of its proper divisors (45840205).

191000725 is an equidigital number, since it uses as much as digits as its factorization.

191000725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7640039 (or 7640034 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 191000725 is about 13820.3011906398. The cubic root of 191000725 is about 575.8972507132.

The spelling of 191000725 in words is "one hundred ninety-one million, seven hundred twenty-five", and thus it is an aban number.