18248551 has 2 divisors, whose sum is σ = 18248552. Its totient is φ = 18248550.

The previous prime is 18248539. The next prime is 18248557. The reversal of 18248551 is 15584281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18248551 - 2⁷ = 18248423 is a prime.

It is a super-2 number, since 2×18248551² = 666019227199202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18248557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9124275 + 9124276.

It is an arithmetic number, because the mean of its divisors is an integer number (9124276).

Almost surely, 2^18248551 is an apocalyptic number.

18248551 is a deficient number, since it is larger than the sum of its proper divisors (1).

18248551 is an equidigital number, since it uses as much as digits as its factorization.

18248551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12800, while the sum is 34.

The square root of 18248551 is about 4271.8322766700. The cubic root of 18248551 is about 263.2749032711.

The spelling of 18248551 in words is "eighteen million, two hundred forty-eight thousand, five hundred fifty-one".