1981413241 has 2 divisors, whose sum is σ = 1981413242. Its totient is φ = 1981413240.

The previous prime is 1981413229. The next prime is 1981413281. The reversal of 1981413241 is 1423141891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1935648016 + 45765225 = 43996^2 + 6765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1981413241 - 2²⁹ = 1444542329 is a prime.

It is a super-3 number, since 3×1981413241³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1981413197 and 1981413206.

It is not a weakly prime, because it can be changed into another prime (1981413281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990706620 + 990706621.

It is an arithmetic number, because the mean of its divisors is an integer number (990706621).

Almost surely, 2^1981413241 is an apocalyptic number.

It is an amenable number.

1981413241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981413241 is an equidigital number, since it uses as much as digits as its factorization.

1981413241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 1981413241 is about 44513.0682047419. The cubic root of 1981413241 is about 1256.0059216542.

The spelling of 1981413241 in words is "one billion, nine hundred eighty-one million, four hundred thirteen thousand, two hundred forty-one".