18125251 has 2 divisors, whose sum is σ = 18125252. Its totient is φ = 18125250.

The previous prime is 18125201. The next prime is 18125267. The reversal of 18125251 is 15252181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18125251 is a prime.

It is not a weakly prime, because it can be changed into another prime (18125201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9062625 + 9062626.

It is an arithmetic number, because the mean of its divisors is an integer number (9062626).

Almost surely, 2^18125251 is an apocalyptic number.

18125251 is a deficient number, since it is larger than the sum of its proper divisors (1).

18125251 is an equidigital number, since it uses as much as digits as its factorization.

18125251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 25.

The square root of 18125251 is about 4257.3760698346. The cubic root of 18125251 is about 262.6806061713.

The spelling of 18125251 in words is "eighteen million, one hundred twenty-five thousand, two hundred fifty-one".