213506863 has 2 divisors, whose sum is σ = 213506864. Its totient is φ = 213506862.

The previous prime is 213506851. The next prime is 213506879. The reversal of 213506863 is 368605312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213506863 - 2⁹ = 213506351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213506563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106753431 + 106753432.

It is an arithmetic number, because the mean of its divisors is an integer number (106753432).

Almost surely, 2^213506863 is an apocalyptic number.

213506863 is a deficient number, since it is larger than the sum of its proper divisors (1).

213506863 is an equidigital number, since it uses as much as digits as its factorization.

213506863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 213506863 is about 14611.8740413405. The cubic root of 213506863 is about 597.6826007729.

It can be divided in two parts, 213506 and 863, that added together give a square (214369 = 463²).

The spelling of 213506863 in words is "two hundred thirteen million, five hundred six thousand, eight hundred sixty-three".