18081031 has 2 divisors, whose sum is σ = 18081032. Its totient is φ = 18081030.

The previous prime is 18081023. The next prime is 18081053. The reversal of 18081031 is 13018081.

It is an a-pointer prime, because the next prime (18081053) can be obtained adding 18081031 to its sum of digits (22).

It is a weak prime.

It is an emirp because it is prime and its reverse (13018081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18081031 - 2³ = 18081023 is a prime.

It is a super-3 number, since 3×18081031³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 18080993 and 18081011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18081131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9040515 + 9040516.

It is an arithmetic number, because the mean of its divisors is an integer number (9040516).

Almost surely, 2^18081031 is an apocalyptic number.

18081031 is a deficient number, since it is larger than the sum of its proper divisors (1).

18081031 is an equidigital number, since it uses as much as digits as its factorization.

18081031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 18081031 is about 4252.1795587675. The cubic root of 18081031 is about 262.4668124332.

The spelling of 18081031 in words is "eighteen million, eighty-one thousand, thirty-one".