16181497 has 2 divisors, whose sum is σ = 16181498. Its totient is φ = 16181496.

The previous prime is 16181479. The next prime is 16181533. The reversal of 16181497 is 79418161.

Together with previous prime (16181479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8503056 + 7678441 = 2916^2 + 2771^2 .

It is an emirp because it is prime and its reverse (79418161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16181497 - 2¹⁹ = 15657209 is a prime.

It is a super-2 number, since 2×16181497² = 523681690322018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16181437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8090748 + 8090749.

It is an arithmetic number, because the mean of its divisors is an integer number (8090749).

Almost surely, 2^16181497 is an apocalyptic number.

It is an amenable number.

16181497 is a deficient number, since it is larger than the sum of its proper divisors (1).

16181497 is an equidigital number, since it uses as much as digits as its factorization.

16181497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 16181497 is about 4022.6231491404. The cubic root of 16181497 is about 252.9334293442.

The spelling of 16181497 in words is "sixteen million, one hundred eighty-one thousand, four hundred ninety-seven".