161243137 has 8 divisors (see below), whose sum is σ = 177288192. Its totient is φ = 145429200.

The previous prime is 161243129. The next prime is 161243143. The reversal of 161243137 is 731342161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161243137 - 2³ = 161243129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161243837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56314 + ... + 59107.

It is an arithmetic number, because the mean of its divisors is an integer number (22161024).

Almost surely, 2^161243137 is an apocalyptic number.

It is an amenable number.

161243137 is a deficient number, since it is larger than the sum of its proper divisors (16045055).

161243137 is a wasteful number, since it uses less digits than its factorization.

161243137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115559.

The product of its digits is 3024, while the sum is 28.

The square root of 161243137 is about 12698.1548659638. The cubic root of 161243137 is about 544.2858946798.

Adding to 161243137 its reverse (731342161), we get a palindrome (892585298).

The spelling of 161243137 in words is "one hundred sixty-one million, two hundred forty-three thousand, one hundred thirty-seven".