9991325 has 12 divisors (see below), whose sum is σ = 13118580. Its totient is φ = 7522560.

The previous prime is 9991313. The next prime is 9991337. The reversal of 9991325 is 5231999.

9991325 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9991313) and next prime (9991337).

It can be written as a sum of positive squares in 6 ways, for example, as 1069156 + 8922169 = 1034^2 + 2987^2 .

It is not a de Polignac number, because 9991325 - 2²² = 5797021 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11330 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (1093215).

Almost surely, 2^9991325 is an apocalyptic number.

It is an amenable number.

9991325 is a deficient number, since it is larger than the sum of its proper divisors (3127255).

9991325 is a wasteful number, since it uses less digits than its factorization.

9991325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23536 (or 23531 counting only the distinct ones).

The product of its digits is 21870, while the sum is 38.

The square root of 9991325 is about 3160.9057246302. The cubic root of 9991325 is about 215.3811519099.

The spelling of 9991325 in words is "nine million, nine hundred ninety-one thousand, three hundred twenty-five".