251211103150231 has 16 divisors (see below), whose sum is σ = 299885704971264. Its totient is φ = 205752374302464.

The previous prime is 251211103150199. The next prime is 251211103150289. The reversal of 251211103150231 is 132051301112152.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 251211103150231 - 2⁵ = 251211103150199 is a prime.

It is a super-2 number, since 2×251211103150231² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251211103150231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251211103150031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 793492506 + ... + 793809031.

It is an arithmetic number, because the mean of its divisors is an integer number (18742856560704).

Almost surely, 2^{251211103150231} is an apocalyptic number.

251211103150231 is a deficient number, since it is larger than the sum of its proper divisors (48674601821033).

251211103150231 is a wasteful number, since it uses less digits than its factorization.

251211103150231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587302550.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 251211103150231 its reverse (132051301112152), we get a palindrome (383262404262383).

The spelling of 251211103150231 in words is "two hundred fifty-one trillion, two hundred eleven billion, one hundred three million, one hundred fifty thousand, two hundred thirty-one".