1968773891 has 12 divisors (see below), whose sum is σ = 2329026840. Its totient is φ = 1658916000.

The previous prime is 1968773879. The next prime is 1968773897. The reversal of 1968773891 is 1983778691.

It is a de Polignac number, because none of the positive numbers 2^k-1968773891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a self number, because there is not a number n which added to its sum of digits gives 1968773891.

It is not an unprimeable number, because it can be changed into a prime (1968773897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 337610 + ... + 343391.

It is an arithmetic number, because the mean of its divisors is an integer number (194085570).

Almost surely, 2^1968773891 is an apocalyptic number.

1968773891 is a deficient number, since it is larger than the sum of its proper divisors (360252949).

1968773891 is an equidigital number, since it uses as much as digits as its factorization.

1968773891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681074 (or 681067 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 59.

The square root of 1968773891 is about 44370.8675935010. The cubic root of 1968773891 is about 1253.3295534646.

The spelling of 1968773891 in words is "one billion, nine hundred sixty-eight million, seven hundred seventy-three thousand, eight hundred ninety-one".