212339581 has 2 divisors, whose sum is σ = 212339582. Its totient is φ = 212339580.

The previous prime is 212339551. The next prime is 212339587. The reversal of 212339581 is 185933212.

212339581 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., 160427556 + 51912025 = 12666^2 + 7205^2 .

It is a cyclic number.

It is not a de Polignac number, because 212339581 - 2¹³ = 212331389 is a prime.

It is a super-2 number, since 2×212339581² = 90176195318511122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212339587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106169790 + 106169791.

It is an arithmetic number, because the mean of its divisors is an integer number (106169791).

Almost surely, 2^212339581 is an apocalyptic number.

It is an amenable number.

212339581 is a deficient number, since it is larger than the sum of its proper divisors (1).

212339581 is an equidigital number, since it uses as much as digits as its factorization.

212339581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 212339581 is about 14571.8763719708. The cubic root of 212339581 is about 596.5913955101.

The spelling of 212339581 in words is "two hundred twelve million, three hundred thirty-nine thousand, five hundred eighty-one".