8161493 has 2 divisors, whose sum is σ = 8161494. Its totient is φ = 8161492.

The previous prime is 8161487. The next prime is 8161511. The reversal of 8161493 is 3941618.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5579044 + 2582449 = 2362^2 + 1607^2 .

It is a cyclic number.

It is not a de Polignac number, because 8161493 - 2⁴ = 8161477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8161403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080746 + 4080747.

It is an arithmetic number, because the mean of its divisors is an integer number (4080747).

Almost surely, 2^8161493 is an apocalyptic number.

It is an amenable number.

8161493 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161493 is an equidigital number, since it uses as much as digits as its factorization.

8161493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 8161493 is about 2856.8326867354. The cubic root of 8161493 is about 201.3368196576.

The spelling of 8161493 in words is "eight million, one hundred sixty-one thousand, four hundred ninety-three".