72545181 has 16 divisors (see below), whose sum is σ = 98864064. Its totient is φ = 47300864.

The previous prime is 72545167. The next prime is 72545191. The reversal of 72545181 is 18154527.

It is a cyclic number.

It is not a de Polignac number, because 72545181 - 2¹⁸ = 72283037 is a prime.

It is a super-2 number, since 2×72545181² = 10525606572645522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72545141) 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, 73765 + ... + 74741.

It is an arithmetic number, because the mean of its divisors is an integer number (6179004).

Almost surely, 2^72545181 is an apocalyptic number.

It is an amenable number.

72545181 is a deficient number, since it is larger than the sum of its proper divisors (26318883).

72545181 is a wasteful number, since it uses less digits than its factorization.

72545181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500.

The product of its digits is 11200, while the sum is 33.

The square root of 72545181 is about 8517.3458894188. The cubic root of 72545181 is about 417.0641460016.

The spelling of 72545181 in words is "seventy-two million, five hundred forty-five thousand, one hundred eighty-one".