212998139 has 2 divisors, whose sum is σ = 212998140. Its totient is φ = 212998138.

The previous prime is 212998133. The next prime is 212998171. The reversal of 212998139 is 931899212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212998139 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212998139.

It is not a weakly prime, because it can be changed into another prime (212998133) 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, 106499069 + 106499070.

It is an arithmetic number, because the mean of its divisors is an integer number (106499070).

Almost surely, 2^212998139 is an apocalyptic number.

212998139 is a deficient number, since it is larger than the sum of its proper divisors (1).

212998139 is an equidigital number, since it uses as much as digits as its factorization.

212998139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 212998139 is about 14594.4557623777. The cubic root of 212998139 is about 597.2075226874.

The spelling of 212998139 in words is "two hundred twelve million, nine hundred ninety-eight thousand, one hundred thirty-nine".