18317401 has 2 divisors, whose sum is σ = 18317402. Its totient is φ = 18317400.

The previous prime is 18317399. The next prime is 18317419. The reversal of 18317401 is 10471381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11289600 + 7027801 = 3360^2 + 2651^2 .

It is a cyclic number.

It is not a de Polignac number, because 18317401 - 2¹ = 18317399 is a prime.

Together with 18317399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18317471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158700 + 9158701.

It is an arithmetic number, because the mean of its divisors is an integer number (9158701).

Almost surely, 2^18317401 is an apocalyptic number.

It is an amenable number.

18317401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18317401 is an equidigital number, since it uses as much as digits as its factorization.

18317401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 18317401 is about 4279.8832928013. The cubic root of 18317401 is about 263.6055912305.

Adding to 18317401 its reverse (10471381), we get a palindrome (28788782).

The spelling of 18317401 in words is "eighteen million, three hundred seventeen thousand, four hundred one".