161138837 has 4 divisors (see below), whose sum is σ = 166336896. Its totient is φ = 155940780.

The previous prime is 161138833. The next prime is 161138893. The reversal of 161138837 is 738831161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 738831161 = 3691 ⋅200171.

It is a cyclic number.

It is not a de Polignac number, because 161138837 - 2² = 161138833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161138837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161138833) 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 in 3 ways as a sum of consecutive naturals, for example, 2598983 + ... + 2599044.

It is an arithmetic number, because the mean of its divisors is an integer number (41584224).

Almost surely, 2^161138837 is an apocalyptic number.

It is an amenable number.

161138837 is a deficient number, since it is larger than the sum of its proper divisors (5198059).

161138837 is an equidigital number, since it uses as much as digits as its factorization.

161138837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5198058.

The product of its digits is 24192, while the sum is 38.

The square root of 161138837 is about 12694.0473057256. The cubic root of 161138837 is about 544.1685123948.

Adding to 161138837 its reverse (738831161), we get a palindrome (899969998).

The spelling of 161138837 in words is "one hundred sixty-one million, one hundred thirty-eight thousand, eight hundred thirty-seven".