18391741 has 2 divisors, whose sum is σ = 18391742. Its totient is φ = 18391740.

The previous prime is 18391727. The next prime is 18391777. The reversal of 18391741 is 14719381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13351716 + 5040025 = 3654^2 + 2245^2 .

It is an emirp because it is prime and its reverse (14719381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18391741 - 2⁷ = 18391613 is a prime.

It is a super-2 number, since 2×18391741² = 676512274022162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18391697 and 18391706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18391441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9195870 + 9195871.

It is an arithmetic number, because the mean of its divisors is an integer number (9195871).

Almost surely, 2^18391741 is an apocalyptic number.

It is an amenable number.

18391741 is a deficient number, since it is larger than the sum of its proper divisors (1).

18391741 is an equidigital number, since it uses as much as digits as its factorization.

18391741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 18391741 is about 4288.5593152013. The cubic root of 18391741 is about 263.9617186994.

The spelling of 18391741 in words is "eighteen million, three hundred ninety-one thousand, seven hundred forty-one".