72232161 has 16 divisors (see below), whose sum is σ = 97929216. Its totient is φ = 47350736.

The previous prime is 72232159. The next prime is 72232187. The reversal of 72232161 is 16123227.

It is a cyclic number.

It is not a de Polignac number, because 72232161 - 2¹ = 72232159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72232151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64936 + ... + 66038.

It is an arithmetic number, because the mean of its divisors is an integer number (6120576).

Almost surely, 2^72232161 is an apocalyptic number.

It is an amenable number.

72232161 is a deficient number, since it is larger than the sum of its proper divisors (25697055).

72232161 is a wasteful number, since it uses less digits than its factorization.

72232161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452.

The product of its digits is 1008, while the sum is 24.

The square root of 72232161 is about 8498.9505822778. The cubic root of 72232161 is about 416.4634277794.

Adding to 72232161 its reverse (16123227), we get a palindrome (88355388).

The spelling of 72232161 in words is "seventy-two million, two hundred thirty-two thousand, one hundred sixty-one".