991252 has 6 divisors (see below), whose sum is σ = 1734698. Its totient is φ = 495624.

The previous prime is 991229. The next prime is 991261. The reversal of 991252 is 252199.

It can be written as a sum of positive squares in only one way, i.e., 586756 + 404496 = 766^2 + 636^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 991252.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123903 + ... + 123910.

2⁹⁹¹²⁵² is an apocalyptic number.

It is an amenable number.

991252 is a deficient number, since it is larger than the sum of its proper divisors (743446).

991252 is a wasteful number, since it uses less digits than its factorization.

991252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247817 (or 247815 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 991252 is about 995.6163919904. The cubic root of 991252 is about 99.7075455377.

The spelling of 991252 in words is "nine hundred ninety-one thousand, two hundred fifty-two".