1991010002 has 8 divisors (see below), whose sum is σ = 3001989756. Its totient is φ = 990346752.

The previous prime is 1991009987. The next prime is 1991010013. The reversal of 1991010002 is 2000101991.

It can be written as a sum of positive squares in 2 ways, for example, as 1742979001 + 248031001 = 41749^2 + 15749^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1991010002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2578643 + ... + 2579414.

Almost surely, 2^1991010002 is an apocalyptic number.

1991010002 is a deficient number, since it is larger than the sum of its proper divisors (1010979754).

1991010002 is a wasteful number, since it uses less digits than its factorization.

1991010002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5158252.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1991010002 is about 44620.7351127253. The cubic root of 1991010002 is about 1258.0304329987.

Adding to 1991010002 its reverse (2000101991), we get a palindrome (3991111993).

The spelling of 1991010002 in words is "one billion, nine hundred ninety-one million, ten thousand, two".