991325 has 12 divisors (see below), whose sum is σ = 1294560. Its totient is φ = 750960.

The previous prime is 991313. The next prime is 991327. The reversal of 991325 is 523199.

991325 = 187² + 188² + ... + 211².

991325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 991325 - 2⁶ = 991261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 569 + ... + 1518.

It is an arithmetic number, because the mean of its divisors is an integer number (107880).

2⁹⁹¹³²⁵ is an apocalyptic number.

991325 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

991325 is a deficient number, since it is larger than the sum of its proper divisors (303235).

991325 is a wasteful number, since it uses less digits than its factorization.

991325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116 (or 2111 counting only the distinct ones).

The product of its digits is 2430, while the sum is 29.

The square root of 991325 is about 995.6530520216. The cubic root of 991325 is about 99.7099931064.

The spelling of 991325 in words is "nine hundred ninety-one thousand, three hundred twenty-five".