981212719 has 2 divisors, whose sum is σ = 981212720. Its totient is φ = 981212718.

The previous prime is 981212717. The next prime is 981212753. The reversal of 981212719 is 917212189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981212719 - 2¹ = 981212717 is a prime.

It is a super-2 number, since 2×981212719² = 1925556799854745922, which contains 22 as substring.

Together with 981212717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981212717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490606359 + 490606360.

It is an arithmetic number, because the mean of its divisors is an integer number (490606360).

Almost surely, 2^981212719 is an apocalyptic number.

981212719 is a deficient number, since it is larger than the sum of its proper divisors (1).

981212719 is an equidigital number, since it uses as much as digits as its factorization.

981212719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 40.

The square root of 981212719 is about 31324.3151401591. The cubic root of 981212719 is about 993.6979404765.

The spelling of 981212719 in words is "nine hundred eighty-one million, two hundred twelve thousand, seven hundred nineteen".