1981814433 has 8 divisors (see below), whose sum is σ = 2642989728. Its totient is φ = 1320924384.

The previous prime is 1981814413. The next prime is 1981814447. The reversal of 1981814433 is 3344181891.

It is a happy number.

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

It is not a de Polignac number, because 1981814433 - 2⁹ = 1981813921 is a prime.

It is a super-2 number, since 2×1981814433² = 7855176893694222978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1981814413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54535 + ... + 83292.

It is an arithmetic number, because the mean of its divisors is an integer number (330373716).

Almost surely, 2^1981814433 is an apocalyptic number.

It is an amenable number.

1981814433 is a deficient number, since it is larger than the sum of its proper divisors (661175295).

1981814433 is a wasteful number, since it uses less digits than its factorization.

1981814433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142623.

The product of its digits is 82944, while the sum is 42.

The square root of 1981814433 is about 44517.5744285333. The cubic root of 1981814433 is about 1256.0906869977.

The spelling of 1981814433 in words is "one billion, nine hundred eighty-one million, eight hundred fourteen thousand, four hundred thirty-three".