1982561343 has 16 divisors (see below), whose sum is σ = 3102696960. Its totient is φ = 1102273056.

The previous prime is 1982561333. The next prime is 1982561359. The reversal of 1982561343 is 3431652891.

It is not a de Polignac number, because 1982561343 - 2⁶ = 1982561279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1982561295 and 1982561304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982561333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275003 + ... + 1276556.

It is an arithmetic number, because the mean of its divisors is an integer number (193918560).

Almost surely, 2^1982561343 is an apocalyptic number.

1982561343 is a deficient number, since it is larger than the sum of its proper divisors (1120135617).

1982561343 is a wasteful number, since it uses less digits than its factorization.

1982561343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551606.

The product of its digits is 155520, while the sum is 42.

The square root of 1982561343 is about 44525.9625724139. The cubic root of 1982561343 is about 1256.2484664618.

The spelling of 1982561343 in words is "one billion, nine hundred eighty-two million, five hundred sixty-one thousand, three hundred forty-three".