213169639 has 2 divisors, whose sum is σ = 213169640. Its totient is φ = 213169638.

The previous prime is 213169631. The next prime is 213169643. The reversal of 213169639 is 936961312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213169639 - 2³ = 213169631 is a prime.

It is equal to p_11766874 and since 213169639 and 11766874 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213169631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106584819 + 106584820.

It is an arithmetic number, because the mean of its divisors is an integer number (106584820).

Almost surely, 2^213169639 is an apocalyptic number.

213169639 is a deficient number, since it is larger than the sum of its proper divisors (1).

213169639 is an equidigital number, since it uses as much as digits as its factorization.

213169639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 40.

The square root of 213169639 is about 14600.3300990080. The cubic root of 213169639 is about 597.3677644843.

It can be divided in two parts, 2 and 13169639, that added together give a square (13169641 = 3629²).

The spelling of 213169639 in words is "two hundred thirteen million, one hundred sixty-nine thousand, six hundred thirty-nine".