1981963294 has 4 divisors (see below), whose sum is σ = 2972944944. Its totient is φ = 990981646.

The previous prime is 1981963279. The next prime is 1981963303. The reversal of 1981963294 is 4923691891.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495490822 + ... + 495490825.

It is an arithmetic number, because the mean of its divisors is an integer number (743236236).

Almost surely, 2^1981963294 is an apocalyptic number.

1981963294 is a deficient number, since it is larger than the sum of its proper divisors (990981650).

1981963294 is an equidigital number, since it uses as much as digits as its factorization.

1981963294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990981649.

The product of its digits is 839808, while the sum is 52.

The square root of 1981963294 is about 44519.2463323448. The cubic root of 1981963294 is about 1256.1221359957.

The spelling of 1981963294 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-three thousand, two hundred ninety-four".