161138607 has 48 divisors (see below), whose sum is σ = 259241472. Its totient is φ = 88717440.

The previous prime is 161138561. The next prime is 161138609. The reversal of 161138607 is 706831161.

It is not a de Polignac number, because 161138607 - 2¹⁰ = 161137583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161138609) 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 47 ways as a sum of consecutive naturals, for example, 573307 + ... + 573587.

It is an arithmetic number, because the mean of its divisors is an integer number (5400864).

Almost surely, 2^161138607 is an apocalyptic number.

161138607 is a deficient number, since it is larger than the sum of its proper divisors (98102865).

161138607 is a wasteful number, since it uses less digits than its factorization.

161138607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 161138607 is about 12694.0382463580. The cubic root of 161138607 is about 544.1682534901.

Adding to 161138607 its reverse (706831161), we get a palindrome (867969768).

The spelling of 161138607 in words is "one hundred sixty-one million, one hundred thirty-eight thousand, six hundred seven".