213486409 has 2 divisors, whose sum is σ = 213486410. Its totient is φ = 213486408.

The previous prime is 213486401. The next prime is 213486439. The reversal of 213486409 is 904684312.

213486409 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., 113486409 + 100000000 = 10653^2 + 10000^2 .

It is a cyclic number.

It is not a de Polignac number, because 213486409 - 2³ = 213486401 is a prime.

It is not a weakly prime, because it can be changed into another prime (213486401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106743204 + 106743205.

It is an arithmetic number, because the mean of its divisors is an integer number (106743205).

Almost surely, 2^213486409 is an apocalyptic number.

It is an amenable number.

213486409 is a deficient number, since it is larger than the sum of its proper divisors (1).

213486409 is an equidigital number, since it uses as much as digits as its factorization.

213486409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 213486409 is about 14611.1741143551. The cubic root of 213486409 is about 597.6635141260.

The spelling of 213486409 in words is "two hundred thirteen million, four hundred eighty-six thousand, four hundred nine".