1980854243 has 2 divisors, whose sum is σ = 1980854244. Its totient is φ = 1980854242.

The previous prime is 1980854233. The next prime is 1980854261. The reversal of 1980854243 is 3424580891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1980854243 - 2¹² = 1980850147 is a prime.

It is a super-2 number, since 2×1980854243² = 7847567064022206098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1980854194 and 1980854203.

It is not a weakly prime, because it can be changed into another prime (1980854233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990427121 + 990427122.

It is an arithmetic number, because the mean of its divisors is an integer number (990427122).

Almost surely, 2^1980854243 is an apocalyptic number.

1980854243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980854243 is an equidigital number, since it uses as much as digits as its factorization.

1980854243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 1980854243 is about 44506.7887293613. The cubic root of 1980854243 is about 1255.8877953895.

The spelling of 1980854243 in words is "one billion, nine hundred eighty million, eight hundred fifty-four thousand, two hundred forty-three".