213654505 has 4 divisors (see below), whose sum is σ = 256385412. Its totient is φ = 170923600.

The previous prime is 213654479. The next prime is 213654509. The reversal of 213654505 is 505456312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 108243216 + 105411289 = 10404^2 + 10267^2 .

It is not a de Polignac number, because 213654505 - 2¹¹ = 213652457 is a prime.

It is a Smith number, since the sum of its digits (31) 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 not an unprimeable number, because it can be changed into a prime (213654509) 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, 21365446 + ... + 21365455.

It is an arithmetic number, because the mean of its divisors is an integer number (64096353).

Almost surely, 2^213654505 is an apocalyptic number.

It is an amenable number.

213654505 is a deficient number, since it is larger than the sum of its proper divisors (42730907).

213654505 is an equidigital number, since it uses as much as digits as its factorization.

213654505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42730906.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 213654505 is about 14616.9252922768. The cubic root of 213654505 is about 597.8203367388.

The spelling of 213654505 in words is "two hundred thirteen million, six hundred fifty-four thousand, five hundred five".