251130000243 has 4 divisors (see below), whose sum is σ = 334840000328. Its totient is φ = 167420000160.

The previous prime is 251130000241. The next prime is 251130000257. The reversal of 251130000243 is 342000031152.

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

It is not a de Polignac number, because 251130000243 - 2¹ = 251130000241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251130000241) 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, 41855000038 + ... + 41855000043.

It is an arithmetic number, because the mean of its divisors is an integer number (83710000082).

Almost surely, 2^251130000243 is an apocalyptic number.

251130000243 is a deficient number, since it is larger than the sum of its proper divisors (83710000085).

251130000243 is an equidigital number, since it uses as much as digits as its factorization.

251130000243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83710000084.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 251130000243 its reverse (342000031152), we get a palindrome (593130031395).

The spelling of 251130000243 in words is "two hundred fifty-one billion, one hundred thirty million, two hundred forty-three", and thus it is an aban number.