161315593 has 2 divisors, whose sum is σ = 161315594. Its totient is φ = 161315592.

The previous prime is 161315591. The next prime is 161315633. The reversal of 161315593 is 395513161.

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., 127057984 + 34257609 = 11272^2 + 5853^2 .

It is a cyclic number.

It is not a de Polignac number, because 161315593 - 2¹ = 161315591 is a prime.

Together with 161315591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (161315591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80657796 + 80657797.

It is an arithmetic number, because the mean of its divisors is an integer number (80657797).

Almost surely, 2^161315593 is an apocalyptic number.

It is an amenable number.

161315593 is a deficient number, since it is larger than the sum of its proper divisors (1).

161315593 is an equidigital number, since it uses as much as digits as its factorization.

161315593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12150, while the sum is 34.

The square root of 161315593 is about 12701.0075584577. The cubic root of 161315593 is about 544.3674089981.

It can be divided in two parts, 16 and 1315593, that added together give a square (1315609 = 1147²).

The spelling of 161315593 in words is "one hundred sixty-one million, three hundred fifteen thousand, five hundred ninety-three".