991548325 has 6 divisors (see below), whose sum is σ = 1229519954. Its totient is φ = 793238640.

The previous prime is 991548263. The next prime is 991548347. The reversal of 991548325 is 523845199.

It can be written as a sum of positive squares in 3 ways, for example, as 16048036 + 975500289 = 4006^2 + 31233^2 .

It is not a de Polignac number, because 991548325 - 2¹⁹ = 991024037 is a prime.

It is a Duffinian number.

It is a congruent 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, 19830942 + ... + 19830991.

Almost surely, 2^991548325 is an apocalyptic number.

It is an amenable number.

991548325 is a deficient number, since it is larger than the sum of its proper divisors (237971629).

991548325 is a wasteful number, since it uses less digits than its factorization.

991548325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39661943 (or 39661938 counting only the distinct ones).

The product of its digits is 388800, while the sum is 46.

The square root of 991548325 is about 31488.8603318697. The cubic root of 991548325 is about 997.1748007660.

The spelling of 991548325 in words is "nine hundred ninety-one million, five hundred forty-eight thousand, three hundred twenty-five".