161287393 has 2 divisors, whose sum is σ = 161287394. Its totient is φ = 161287392.

The previous prime is 161287387. The next prime is 161287397. The reversal of 161287393 is 393782161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119968209 + 41319184 = 10953^2 + 6428^2 .

It is an emirp because it is prime and its reverse (393782161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161287393 - 2⁵ = 161287361 is a prime.

It is not a weakly prime, because it can be changed into another prime (161287397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80643696 + 80643697.

It is an arithmetic number, because the mean of its divisors is an integer number (80643697).

Almost surely, 2^161287393 is an apocalyptic number.

It is an amenable number.

161287393 is a deficient number, since it is larger than the sum of its proper divisors (1).

161287393 is an equidigital number, since it uses as much as digits as its factorization.

161287393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 161287393 is about 12699.8973617900. The cubic root of 161287393 is about 544.3356863868.

The spelling of 161287393 in words is "one hundred sixty-one million, two hundred eighty-seven thousand, three hundred ninety-three".