72137237 has 2 divisors, whose sum is σ = 72137238. Its totient is φ = 72137236.

The previous prime is 72137231. The next prime is 72137257. The reversal of 72137237 is 73273127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38427601 + 33709636 = 6199^2 + 5806^2 .

It is an emirp because it is prime and its reverse (73273127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72137237 - 2⁶ = 72137173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72137231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36068618 + 36068619.

It is an arithmetic number, because the mean of its divisors is an integer number (36068619).

Almost surely, 2^72137237 is an apocalyptic number.

It is an amenable number.

72137237 is a deficient number, since it is larger than the sum of its proper divisors (1).

72137237 is an equidigital number, since it uses as much as digits as its factorization.

72137237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12348, while the sum is 32.

The square root of 72137237 is about 8493.3642921989. The cubic root of 72137237 is about 416.2809157990.

The spelling of 72137237 in words is "seventy-two million, one hundred thirty-seven thousand, two hundred thirty-seven".