981212699 has 2 divisors, whose sum is σ = 981212700. Its totient is φ = 981212698.

The previous prime is 981212693. The next prime is 981212717. The reversal of 981212699 is 996212189.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981212699 is a prime.

It is not a weakly prime, because it can be changed into another prime (981212693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490606349 + 490606350.

It is an arithmetic number, because the mean of its divisors is an integer number (490606350).

Almost surely, 2^981212699 is an apocalyptic number.

981212699 is a deficient number, since it is larger than the sum of its proper divisors (1).

981212699 is an equidigital number, since it uses as much as digits as its factorization.

981212699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 981212699 is about 31324.3148209183. The cubic root of 981212699 is about 993.6979337250.

The spelling of 981212699 in words is "nine hundred eighty-one million, two hundred twelve thousand, six hundred ninety-nine".