161331593 has 2 divisors, whose sum is σ = 161331594. Its totient is φ = 161331592.

The previous prime is 161331587. The next prime is 161331607. The reversal of 161331593 is 395133161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114982729 + 46348864 = 10723^2 + 6808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161331593 is a prime.

It is not a weakly prime, because it can be changed into another prime (161331503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80665796 + 80665797.

It is an arithmetic number, because the mean of its divisors is an integer number (80665797).

Almost surely, 2^161331593 is an apocalyptic number.

It is an amenable number.

161331593 is a deficient number, since it is larger than the sum of its proper divisors (1).

161331593 is an equidigital number, since it uses as much as digits as its factorization.

161331593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 32.

The square root of 161331593 is about 12701.6374141289. The cubic root of 161331593 is about 544.3854059989.

The spelling of 161331593 in words is "one hundred sixty-one million, three hundred thirty-one thousand, five hundred ninety-three".