991020002 has 12 divisors (see below), whose sum is σ = 1729228950. Its totient is φ = 424722816.

The previous prime is 991019923. The next prime is 991020007. The reversal of 991020002 is 200020199.

991020002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 497691481 + 493328521 = 22309^2 + 22211^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 991020002.

It is not an unprimeable number, because it can be changed into a prime (991020007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5056127 + ... + 5056322.

Almost surely, 2^991020002 is an apocalyptic number.

991020002 is a deficient number, since it is larger than the sum of its proper divisors (738208948).

991020002 is a wasteful number, since it uses less digits than its factorization.

991020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10112465 (or 10112458 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 991020002 is about 31480.4701680264. The cubic root of 991020002 is about 996.9976623229.

The spelling of 991020002 in words is "nine hundred ninety-one million, twenty thousand, two".