72233261 has 2 divisors, whose sum is σ = 72233262. Its totient is φ = 72233260.

The previous prime is 72233251. The next prime is 72233279. The reversal of 72233261 is 16233227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59136100 + 13097161 = 7690^2 + 3619^2 .

It is a cyclic number.

It is not a de Polignac number, because 72233261 - 2⁶ = 72233197 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72233261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72233251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36116630 + 36116631.

It is an arithmetic number, because the mean of its divisors is an integer number (36116631).

Almost surely, 2^72233261 is an apocalyptic number.

It is an amenable number.

72233261 is a deficient number, since it is larger than the sum of its proper divisors (1).

72233261 is an equidigital number, since it uses as much as digits as its factorization.

72233261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 26.

The square root of 72233261 is about 8499.0152959034. The cubic root of 72233261 is about 416.4655418305.

Adding to 72233261 its reverse (16233227), we get a palindrome (88466488).

The spelling of 72233261 in words is "seventy-two million, two hundred thirty-three thousand, two hundred sixty-one".