212310409 has 2 divisors, whose sum is σ = 212310410. Its totient is φ = 212310408.

The previous prime is 212310391. The next prime is 212310451. The reversal of 212310409 is 904013212.

212310409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191407225 + 20903184 = 13835^2 + 4572^2 .

It is a cyclic number.

It is not a de Polignac number, because 212310409 - 2⁹ = 212309897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212310409.

It is not a weakly prime, because it can be changed into another prime (212310509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106155204 + 106155205.

It is an arithmetic number, because the mean of its divisors is an integer number (106155205).

Almost surely, 2^212310409 is an apocalyptic number.

It is an amenable number.

212310409 is a deficient number, since it is larger than the sum of its proper divisors (1).

212310409 is an equidigital number, since it uses as much as digits as its factorization.

212310409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 212310409 is about 14570.8753683504. The cubic root of 212310409 is about 596.5640736119.

The spelling of 212310409 in words is "two hundred twelve million, three hundred ten thousand, four hundred nine".