72545261 has 2 divisors, whose sum is σ = 72545262. Its totient is φ = 72545260.

The previous prime is 72545227. The next prime is 72545281. The reversal of 72545261 is 16254527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 1142761 = 8450^2 + 1069^2 .

It is a cyclic number.

It is not a de Polignac number, because 72545261 - 2¹⁸ = 72283117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72545281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36272630 + 36272631.

It is an arithmetic number, because the mean of its divisors is an integer number (36272631).

Almost surely, 2^72545261 is an apocalyptic number.

It is an amenable number.

72545261 is a deficient number, since it is larger than the sum of its proper divisors (1).

72545261 is an equidigital number, since it uses as much as digits as its factorization.

72545261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

The square root of 72545261 is about 8517.3505857162. The cubic root of 72545261 is about 417.0642993089.

Adding to 72545261 its reverse (16254527), we get a palindrome (88799788).

It can be divided in two parts, 7254526 and 1, that added together give a palindrome (7254527).

The spelling of 72545261 in words is "seventy-two million, five hundred forty-five thousand, two hundred sixty-one".