991570312 has 8 divisors (see below), whose sum is σ = 1859194350. Its totient is φ = 495785152.

The previous prime is 991570303. The next prime is 991570331. The reversal of 991570312 is 213075199.

It can be written as a sum of positive squares in only one way, i.e., 635342436 + 356227876 = 25206^2 + 18874^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61973137 + ... + 61973152.

Almost surely, 2^991570312 is an apocalyptic number.

It is an amenable number.

991570312 is a deficient number, since it is larger than the sum of its proper divisors (867624038).

991570312 is a wasteful number, since it uses less digits than its factorization.

991570312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123946295 (or 123946291 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 991570312 is about 31489.2094533985. The cubic root of 991570312 is about 997.1821712994.

The spelling of 991570312 in words is "nine hundred ninety-one million, five hundred seventy thousand, three hundred twelve".