212911481 has 2 divisors, whose sum is σ = 212911482. Its totient is φ = 212911480.

The previous prime is 212911469. The next prime is 212911487. The reversal of 212911481 is 184119212.

212911481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153760000 + 59151481 = 12400^2 + 7691^2 .

It is a cyclic number.

It is not a de Polignac number, because 212911481 - 2¹⁰ = 212910457 is a prime.

It is a super-2 number, since 2×212911481² = 90662597483226722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212911487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106455740 + 106455741.

It is an arithmetic number, because the mean of its divisors is an integer number (106455741).

Almost surely, 2^212911481 is an apocalyptic number.

It is an amenable number.

212911481 is a deficient number, since it is larger than the sum of its proper divisors (1).

212911481 is an equidigital number, since it uses as much as digits as its factorization.

212911481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 29.

The square root of 212911481 is about 14591.4865932159. The cubic root of 212911481 is about 597.1265206814.

The spelling of 212911481 in words is "two hundred twelve million, nine hundred eleven thousand, four hundred eighty-one".