161315638 has 16 divisors (see below), whose sum is σ = 264177936. Its totient is φ = 73267840.

The previous prime is 161315633. The next prime is 161315639. The reversal of 161315638 is 836513161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161315633) 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 7 ways as a sum of consecutive naturals, for example, 40170 + ... + 44002.

It is an arithmetic number, because the mean of its divisors is an integer number (16511121).

Almost surely, 2^161315638 is an apocalyptic number.

161315638 is a deficient number, since it is larger than the sum of its proper divisors (102862298).

161315638 is a wasteful number, since it uses less digits than its factorization.

161315638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5759.

The product of its digits is 12960, while the sum is 34.

The square root of 161315638 is about 12701.0093299706. The cubic root of 161315638 is about 544.3674596163.

Adding to 161315638 its reverse (836513161), we get a palindrome (997828799).

The spelling of 161315638 in words is "one hundred sixty-one million, three hundred fifteen thousand, six hundred thirty-eight".