18342251 has 2 divisors, whose sum is σ = 18342252. Its totient is φ = 18342250.

The previous prime is 18342223. The next prime is 18342263. The reversal of 18342251 is 15224381.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18342251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18342251.

It is not a weakly prime, because it can be changed into another prime (18342851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9171125 + 9171126.

It is an arithmetic number, because the mean of its divisors is an integer number (9171126).

Almost surely, 2^18342251 is an apocalyptic number.

18342251 is a deficient number, since it is larger than the sum of its proper divisors (1).

18342251 is an equidigital number, since it uses as much as digits as its factorization.

18342251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 18342251 is about 4282.7854253978. The cubic root of 18342251 is about 263.7247427578.

The spelling of 18342251 in words is "eighteen million, three hundred forty-two thousand, two hundred fifty-one".