1991929203 has 48 divisors (see below), whose sum is σ = 3188315520. Its totient is φ = 1188316800.

The previous prime is 1991929169. The next prime is 1991929207. The reversal of 1991929203 is 3029291991.

It is not a de Polignac number, because 1991929203 - 2⁹ = 1991928691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1991929207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2916100 + ... + 2916782.

It is an arithmetic number, because the mean of its divisors is an integer number (66423240).

Almost surely, 2^1991929203 is an apocalyptic number.

1991929203 is a deficient number, since it is larger than the sum of its proper divisors (1196386317).

1991929203 is a wasteful number, since it uses less digits than its factorization.

1991929203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120 (or 1117 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 1991929203 is about 44631.0340794385. The cubic root of 1991929203 is about 1258.2240039198.

The spelling of 1991929203 in words is "one billion, nine hundred ninety-one million, nine hundred twenty-nine thousand, two hundred three".