18250381 has 2 divisors, whose sum is σ = 18250382. Its totient is φ = 18250380.

The previous prime is 18250373. The next prime is 18250399. The reversal of 18250381 is 18305281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17147881 + 1102500 = 4141^2 + 1050^2 .

It is a cyclic number.

It is not a de Polignac number, because 18250381 - 2³ = 18250373 is a prime.

It is a super-2 number, since 2×18250381² = 666152813290322, which contains 22 as substring.

It is equal to p_1166275 and since 18250381 and 1166275 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18250301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9125190 + 9125191.

It is an arithmetic number, because the mean of its divisors is an integer number (9125191).

Almost surely, 2^18250381 is an apocalyptic number.

It is an amenable number.

18250381 is a deficient number, since it is larger than the sum of its proper divisors (1).

18250381 is an equidigital number, since it uses as much as digits as its factorization.

18250381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18250381 is about 4272.0464651031. The cubic root of 18250381 is about 263.2837035491.

The spelling of 18250381 in words is "eighteen million, two hundred fifty thousand, three hundred eighty-one".