991022111000002 has 4 divisors (see below), whose sum is σ = 1486533166500006. Its totient is φ = 495511055500000.

The previous prime is 991022110999969. The next prime is 991022111000111. The reversal of 991022111000002 is 200000111220199.

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., 595113634292401 + 395908476707601 = 24394951^2 + 19897449^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247755527749999 + ... + 247755527750002.

Almost surely, 2^{991022111000002} is an apocalyptic number.

991022111000002 is a deficient number, since it is larger than the sum of its proper divisors (495511055500004).

991022111000002 is a wasteful number, since it uses less digits than its factorization.

991022111000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495511055500003.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 991022111000002 in words is "nine hundred ninety-one trillion, twenty-two billion, one hundred eleven million, two", and thus it is an aban number.