251230411205 has 16 divisors (see below), whose sum is σ = 309285923184. Its totient is φ = 195792529920.

The previous prime is 251230411193. The next prime is 251230411213. The reversal of 251230411205 is 502114032152.

It can be written as a sum of positive squares in 8 ways, for example, as 12857972449 + 238372438756 = 113393^2 + 488234^2 .

It is not a de Polignac number, because 251230411205 - 2⁴ = 251230411189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 766322 + ... + 1043891.

It is an arithmetic number, because the mean of its divisors is an integer number (19330370199).

Almost surely, 2^251230411205 is an apocalyptic number.

It is an amenable number.

251230411205 is a deficient number, since it is larger than the sum of its proper divisors (58055511979).

251230411205 is a wasteful number, since it uses less digits than its factorization.

251230411205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810936.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 251230411205 its reverse (502114032152), we get a palindrome (753344443357).

The spelling of 251230411205 in words is "two hundred fifty-one billion, two hundred thirty million, four hundred eleven thousand, two hundred five".