1991298030902 has 8 divisors (see below), whose sum is σ = 2992815313200. Its totient is φ = 993692926504.

The previous prime is 1991298030859. The next prime is 1991298030923. The reversal of 1991298030902 is 2090308921991.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 978043202 + ... + 978045237.

It is an arithmetic number, because the mean of its divisors is an integer number (374101914150).

Almost surely, 2^{1991298030902} is an apocalyptic number.

1991298030902 is a deficient number, since it is larger than the sum of its proper divisors (1001517282298).

1991298030902 is a wasteful number, since it uses less digits than its factorization.

1991298030902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956088950.

The product of its (nonzero) digits is 629856, while the sum is 53.

The spelling of 1991298030902 in words is "one trillion, nine hundred ninety-one billion, two hundred ninety-eight million, thirty thousand, nine hundred two".