212991853 has 2 divisors, whose sum is σ = 212991854. Its totient is φ = 212991852.

The previous prime is 212991839. The next prime is 212991859. The reversal of 212991853 is 358199212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153809604 + 59182249 = 12402^2 + 7693^2 .

It is a cyclic number.

It is not a de Polignac number, because 212991853 - 2²¹ = 210894701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212991859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106495926 + 106495927.

It is an arithmetic number, because the mean of its divisors is an integer number (106495927).

Almost surely, 2^212991853 is an apocalyptic number.

It is an amenable number.

212991853 is a deficient number, since it is larger than the sum of its proper divisors (1).

212991853 is an equidigital number, since it uses as much as digits as its factorization.

212991853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 212991853 is about 14594.2404050365. The cubic root of 212991853 is about 597.2016477011.

The spelling of 212991853 in words is "two hundred twelve million, nine hundred ninety-one thousand, eight hundred fifty-three".