213638255 has 4 divisors (see below), whose sum is σ = 256365912. Its totient is φ = 170910600.

The previous prime is 213638231. The next prime is 213638279. The reversal of 213638255 is 552836312.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (213638231) and next prime (213638279).

It is not a de Polignac number, because 213638255 - 2⁸ = 213637999 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21363821 + ... + 21363830.

It is an arithmetic number, because the mean of its divisors is an integer number (64091478).

Almost surely, 2^213638255 is an apocalyptic number.

213638255 is a deficient number, since it is larger than the sum of its proper divisors (42727657).

213638255 is an equidigital number, since it uses as much as digits as its factorization.

213638255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42727656.

The product of its digits is 43200, while the sum is 35.

The square root of 213638255 is about 14616.3694192505. The cubic root of 213638255 is about 597.8051801402.

The spelling of 213638255 in words is "two hundred thirteen million, six hundred thirty-eight thousand, two hundred fifty-five".