251123404247 has 2 divisors, whose sum is σ = 251123404248. Its totient is φ = 251123404246.

The previous prime is 251123404229. The next prime is 251123404289. The reversal of 251123404247 is 742404321152.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251123404247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251123401247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125561702123 + 125561702124.

It is an arithmetic number, because the mean of its divisors is an integer number (125561702124).

Almost surely, 2^251123404247 is an apocalyptic number.

251123404247 is a deficient number, since it is larger than the sum of its proper divisors (1).

251123404247 is an equidigital number, since it uses as much as digits as its factorization.

251123404247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 35.

Adding to 251123404247 its reverse (742404321152), we get a palindrome (993527725399).

The spelling of 251123404247 in words is "two hundred fifty-one billion, one hundred twenty-three million, four hundred four thousand, two hundred forty-seven".