1981969273 has 16 divisors (see below), whose sum is σ = 2047451904. Its totient is φ = 1917589120.

The previous prime is 1981969261. The next prime is 1981969289. The reversal of 1981969273 is 3729691891.

It is a cyclic number.

It is not a de Polignac number, because 1981969273 - 2²¹ = 1979872121 is a prime.

It is a super-2 number, since 2×1981969273² = 7856404398232297058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981961273) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2040678 + ... + 2041648.

It is an arithmetic number, because the mean of its divisors is an integer number (127965744).

Almost surely, 2^1981969273 is an apocalyptic number.

It is an amenable number.

1981969273 is a deficient number, since it is larger than the sum of its proper divisors (65482631).

1981969273 is a wasteful number, since it uses less digits than its factorization.

1981969273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472.

The product of its digits is 1469664, while the sum is 55.

The square root of 1981969273 is about 44519.3134830267. The cubic root of 1981969273 is about 1256.1233991113.

The spelling of 1981969273 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-nine thousand, two hundred seventy-three".