212903681 has 2 divisors, whose sum is σ = 212903682. Its totient is φ = 212903680.

The previous prime is 212903671. The next prime is 212903687. The reversal of 212903681 is 186309212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212897281 + 6400 = 14591^2 + 80^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212903681 is a prime.

It is a super-2 number, since 2×212903681² = 90655954766699522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212903687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106451840 + 106451841.

It is an arithmetic number, because the mean of its divisors is an integer number (106451841).

Almost surely, 2^212903681 is an apocalyptic number.

It is an amenable number.

212903681 is a deficient number, since it is larger than the sum of its proper divisors (1).

212903681 is an equidigital number, since it uses as much as digits as its factorization.

212903681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 212903681 is about 14591.2193116271. The cubic root of 212903681 is about 597.1192286936.

The spelling of 212903681 in words is "two hundred twelve million, nine hundred three thousand, six hundred eighty-one".