981481819 has 2 divisors, whose sum is σ = 981481820. Its totient is φ = 981481818.

The previous prime is 981481817. The next prime is 981481877. The reversal of 981481819 is 918184189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981481819 - 2¹ = 981481817 is a prime.

It is a super-2 number, since 2×981481819² = 1926613122055097522, which contains 22 as substring.

Together with 981481817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (981481811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490740909 + 490740910.

It is an arithmetic number, because the mean of its divisors is an integer number (490740910).

Almost surely, 2^981481819 is an apocalyptic number.

981481819 is a deficient number, since it is larger than the sum of its proper divisors (1).

981481819 is an equidigital number, since it uses as much as digits as its factorization.

981481819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 49.

The square root of 981481819 is about 31328.6102309056. The cubic root of 981481819 is about 993.7887735409.

The spelling of 981481819 in words is "nine hundred eighty-one million, four hundred eighty-one thousand, eight hundred nineteen".