213681653 has 4 divisors (see below), whose sum is σ = 226251180. Its totient is φ = 201112128.

The previous prime is 213681647. The next prime is 213681659. The reversal of 213681653 is 356186312.

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 (213681647) and next prime (213681659).

It can be written as a sum of positive squares in 2 ways, for example, as 164429329 + 49252324 = 12823^2 + 7018^2 .

It is a cyclic number.

It is not a de Polignac number, because 213681653 - 2¹⁰ = 213680629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213681659) 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, 6284738 + ... + 6284771.

It is an arithmetic number, because the mean of its divisors is an integer number (56562795).

Almost surely, 2^213681653 is an apocalyptic number.

It is an amenable number.

213681653 is a deficient number, since it is larger than the sum of its proper divisors (12569527).

213681653 is a wasteful number, since it uses less digits than its factorization.

213681653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12569526.

The product of its digits is 25920, while the sum is 35.

The square root of 213681653 is about 14617.8539122540. The cubic root of 213681653 is about 597.8456563378.

The spelling of 213681653 in words is "two hundred thirteen million, six hundred eighty-one thousand, six hundred fifty-three".