213859391 has 2 divisors, whose sum is σ = 213859392. Its totient is φ = 213859390.

The previous prime is 213859367. The next prime is 213859397. The reversal of 213859391 is 193958312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213859391 - 2²² = 209665087 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213859397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106929695 + 106929696.

It is an arithmetic number, because the mean of its divisors is an integer number (106929696).

Almost surely, 2^213859391 is an apocalyptic number.

213859391 is a deficient number, since it is larger than the sum of its proper divisors (1).

213859391 is an equidigital number, since it uses as much as digits as its factorization.

213859391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 213859391 is about 14623.9321319541. The cubic root of 213859391 is about 598.0113708348.

The spelling of 213859391 in words is "two hundred thirteen million, eight hundred fifty-nine thousand, three hundred ninety-one".