9725491 has 2 divisors, whose sum is σ = 9725492. Its totient is φ = 9725490.

The previous prime is 9725489. The next prime is 9725531. The reversal of 9725491 is 1945279.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9725491 - 2¹ = 9725489 is a prime.

Together with 9725489, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 9725491.

It is not a weakly prime, because it can be changed into another prime (9725431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4862745 + 4862746.

It is an arithmetic number, because the mean of its divisors is an integer number (4862746).

Almost surely, 2^9725491 is an apocalyptic number.

9725491 is a deficient number, since it is larger than the sum of its proper divisors (1).

9725491 is an equidigital number, since it uses as much as digits as its factorization.

9725491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 9725491 is about 3118.5719488253. The cubic root of 9725491 is about 213.4537777437.

The spelling of 9725491 in words is "nine million, seven hundred twenty-five thousand, four hundred ninety-one".