18162031 has 2 divisors, whose sum is σ = 18162032. Its totient is φ = 18162030.

The previous prime is 18162007. The next prime is 18162037. The reversal of 18162031 is 13026181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18162031 - 2⁷ = 18161903 is a prime.

It is a super-2 number, since 2×18162031² = 659718740089922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18161993 and 18162011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18162037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9081015 + 9081016.

It is an arithmetic number, because the mean of its divisors is an integer number (9081016).

Almost surely, 2^18162031 is an apocalyptic number.

18162031 is a deficient number, since it is larger than the sum of its proper divisors (1).

18162031 is an equidigital number, since it uses as much as digits as its factorization.

18162031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18162031 is about 4261.6934427525. The cubic root of 18162031 is about 262.8581644488.

The spelling of 18162031 in words is "eighteen million, one hundred sixty-two thousand, thirty-one".