161357689 has 4 divisors (see below), whose sum is σ = 161386740. Its totient is φ = 161328640.

The previous prime is 161357687. The next prime is 161357723. The reversal of 161357689 is 986753161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64000000 + 97357689 = 8000^2 + 9867^2 .

It is a cyclic number.

It is not a de Polignac number, because 161357689 - 2¹ = 161357687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161357683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3304 + ... + 18265.

It is an arithmetic number, because the mean of its divisors is an integer number (40346685).

Almost surely, 2^161357689 is an apocalyptic number.

It is an amenable number.

161357689 is a deficient number, since it is larger than the sum of its proper divisors (29051).

161357689 is an equidigital number, since it uses as much as digits as its factorization.

161357689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29050.

The product of its digits is 272160, while the sum is 46.

The square root of 161357689 is about 12702.6646417199. The cubic root of 161357689 is about 544.4147565545.

The spelling of 161357689 in words is "one hundred sixty-one million, three hundred fifty-seven thousand, six hundred eighty-nine".