1981962111 has 8 divisors (see below), whose sum is σ = 2647198384. Its totient is φ = 1319016960.

The previous prime is 1981962107. The next prime is 1981962121. The reversal of 1981962111 is 1112691891.

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

It is not a de Polignac number, because 1981962111 - 2² = 1981962107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1981962111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981962121) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 570760 + ... + 574221.

It is an arithmetic number, because the mean of its divisors is an integer number (330899798).

Almost surely, 2^1981962111 is an apocalyptic number.

1981962111 is a deficient number, since it is larger than the sum of its proper divisors (665236273).

1981962111 is a wasteful number, since it uses less digits than its factorization.

1981962111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145561.

The product of its digits is 7776, while the sum is 39.

The square root of 1981962111 is about 44519.2330459544. The cubic root of 1981962111 is about 1256.1218860763.

The spelling of 1981962111 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-two thousand, one hundred eleven".