161137501 has 8 divisors (see below), whose sum is σ = 184383360. Its totient is φ = 137948208.

The previous prime is 161137489. The next prime is 161137507. The reversal of 161137501 is 105731161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161137501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161137507) 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, 7846 + ... + 19591.

It is an arithmetic number, because the mean of its divisors is an integer number (23047920).

Almost surely, 2^161137501 is an apocalyptic number.

It is an amenable number.

161137501 is a deficient number, since it is larger than the sum of its proper divisors (23245859).

161137501 is an equidigital number, since it uses as much as digits as its factorization.

161137501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28283.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 161137501 is about 12693.9946825261. The cubic root of 161137501 is about 544.1670084927.

Adding to 161137501 its reverse (105731161), we get a palindrome (266868662).

The spelling of 161137501 in words is "one hundred sixty-one million, one hundred thirty-seven thousand, five hundred one".