72530261 has 2 divisors, whose sum is σ = 72530262. Its totient is φ = 72530260.

The previous prime is 72530257. The next prime is 72530309. The reversal of 72530261 is 16203527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55965361 + 16564900 = 7481^2 + 4070^2 .

It is a cyclic number.

It is not a de Polignac number, because 72530261 - 2² = 72530257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72530261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72530761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36265130 + 36265131.

It is an arithmetic number, because the mean of its divisors is an integer number (36265131).

Almost surely, 2^72530261 is an apocalyptic number.

It is an amenable number.

72530261 is a deficient number, since it is larger than the sum of its proper divisors (1).

72530261 is an equidigital number, since it uses as much as digits as its factorization.

72530261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 72530261 is about 8516.4699846826. The cubic root of 72530261 is about 417.0355522177.

Adding to 72530261 its reverse (16203527), we get a palindrome (88733788).

The spelling of 72530261 in words is "seventy-two million, five hundred thirty thousand, two hundred sixty-one".