213135245 has 4 divisors (see below), whose sum is σ = 255762300. Its totient is φ = 170508192.

The previous prime is 213135211. The next prime is 213135301. The reversal of 213135245 is 542531312.

It is a happy number.

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 116683204 + 96452041 = 10802^2 + 9821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213135245 is a prime.

It is a super-2 number, since 2×213135245² = 90853265322420050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21313520 + ... + 21313529.

It is an arithmetic number, because the mean of its divisors is an integer number (63940575).

Almost surely, 2^213135245 is an apocalyptic number.

It is an amenable number.

213135245 is a deficient number, since it is larger than the sum of its proper divisors (42627055).

213135245 is an equidigital number, since it uses as much as digits as its factorization.

213135245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42627054.

The product of its digits is 3600, while the sum is 26.

The square root of 213135245 is about 14599.1522014122. The cubic root of 213135245 is about 597.3356351872.

Adding to 213135245 its reverse (542531312), we get a palindrome (755666557).

The spelling of 213135245 in words is "two hundred thirteen million, one hundred thirty-five thousand, two hundred forty-five".