1981969274 has 8 divisors (see below), whose sum is σ = 3045465108. Its totient is φ = 966814240.

The previous prime is 1981969261. The next prime is 1981969289. The reversal of 1981969274 is 4729691891.

It can be written as a sum of positive squares in 2 ways, for example, as 1918878025 + 63091249 = 43805^2 + 7943^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12085097 + ... + 12085260.

Almost surely, 2^1981969274 is an apocalyptic number.

1981969274 is a deficient number, since it is larger than the sum of its proper divisors (1063495834).

1981969274 is a wasteful number, since it uses less digits than its factorization.

1981969274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24170400.

The product of its digits is 1959552, while the sum is 56.

The square root of 1981969274 is about 44519.3134942577. The cubic root of 1981969274 is about 1256.1233993226.

The spelling of 1981969274 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-nine thousand, two hundred seventy-four".