213686455 has 4 divisors (see below), whose sum is σ = 256423752. Its totient is φ = 170949160.

The previous prime is 213686453. The next prime is 213686497. The reversal of 213686455 is 554686312.

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

It is not a de Polignac number, because 213686455 - 2¹ = 213686453 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213686453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21368641 + ... + 21368650.

It is an arithmetic number, because the mean of its divisors is an integer number (64105938).

Almost surely, 2^213686455 is an apocalyptic number.

213686455 is a deficient number, since it is larger than the sum of its proper divisors (42737297).

213686455 is an equidigital number, since it uses as much as digits as its factorization.

213686455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42737296.

The product of its digits is 172800, while the sum is 40.

The square root of 213686455 is about 14618.0181625281. The cubic root of 213686455 is about 597.8501347028.

The spelling of 213686455 in words is "two hundred thirteen million, six hundred eighty-six thousand, four hundred fifty-five".