991007002 has 4 divisors (see below), whose sum is σ = 1486510506. Its totient is φ = 495503500.

The previous prime is 991006967. The next prime is 991007057. The reversal of 991007002 is 200700199.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 788542561 + 202464441 = 28081^2 + 14229^2 .

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, 247751749 + ... + 247751752.

Almost surely, 2^991007002 is an apocalyptic number.

991007002 is a deficient number, since it is larger than the sum of its proper divisors (495503504).

991007002 is a wasteful number, since it uses less digits than its factorization.

991007002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495503503.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 991007002 is about 31480.2636901281. The cubic root of 991007002 is about 996.9933028326.

The spelling of 991007002 in words is "nine hundred ninety-one million, seven thousand, two".