18155953 has 2 divisors, whose sum is σ = 18155954. Its totient is φ = 18155952.

The previous prime is 18155941. The next prime is 18155957. The reversal of 18155953 is 35955181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15618304 + 2537649 = 3952^2 + 1593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18155953 is a prime.

It is not a weakly prime, because it can be changed into another prime (18155957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9077976 + 9077977.

It is an arithmetic number, because the mean of its divisors is an integer number (9077977).

Almost surely, 2^18155953 is an apocalyptic number.

It is an amenable number.

18155953 is a deficient number, since it is larger than the sum of its proper divisors (1).

18155953 is an equidigital number, since it uses as much as digits as its factorization.

18155953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 37.

The square root of 18155953 is about 4260.9802862722. The cubic root of 18155953 is about 262.8288389808.

The spelling of 18155953 in words is "eighteen million, one hundred fifty-five thousand, nine hundred fifty-three".