205223541251 has 4 divisors (see below), whose sum is σ = 208034822712. Its totient is φ = 202412259792.

The previous prime is 205223541241. The next prime is 205223541283. The reversal of 205223541251 is 152145322502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205223541251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205223541241) 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, 1405640621 + ... + 1405640766.

It is an arithmetic number, because the mean of its divisors is an integer number (52008705678).

Almost surely, 2^205223541251 is an apocalyptic number.

205223541251 is a deficient number, since it is larger than the sum of its proper divisors (2811281461).

205223541251 is an equidigital number, since it uses as much as digits as its factorization.

205223541251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811281460.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 205223541251 its reverse (152145322502), we get a palindrome (357368863753).

The spelling of 205223541251 in words is "two hundred five billion, two hundred twenty-three million, five hundred forty-one thousand, two hundred fifty-one".