212611405 has 16 divisors (see below), whose sum is σ = 259809264. Its totient is φ = 166993920.

The previous prime is 212611381. The next prime is 212611429. The reversal of 212611405 is 504116212.

It is an interprime number because it is at equal distance from previous prime (212611381) and next prime (212611429).

It can be written as a sum of positive squares in 8 ways, for example, as 33212169 + 179399236 = 5763^2 + 13394^2 .

It is not a de Polignac number, because 212611405 - 2⁷ = 212611277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86757 + ... + 89173.

It is an arithmetic number, because the mean of its divisors is an integer number (16238079).

Almost surely, 2^212611405 is an apocalyptic number.

It is an amenable number.

212611405 is a deficient number, since it is larger than the sum of its proper divisors (47197859).

212611405 is a wasteful number, since it uses less digits than its factorization.

212611405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 212611405 is about 14581.2003964008. The cubic root of 212611405 is about 596.8458600943.

Adding to 212611405 its reverse (504116212), we get a palindrome (716727617).

It can be divided in two parts, 2126 and 11405, that added together give a palindrome (13531).

The spelling of 212611405 in words is "two hundred twelve million, six hundred eleven thousand, four hundred five".