72797261 has 2 divisors, whose sum is σ = 72797262. Its totient is φ = 72797260.

The previous prime is 72797243. The next prime is 72797287. The reversal of 72797261 is 16279727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 1394761 = 8450^2 + 1181^2 .

It is a cyclic number.

It is not a de Polignac number, because 72797261 - 2¹⁸ = 72535117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72797201) 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, 36398630 + 36398631.

It is an arithmetic number, because the mean of its divisors is an integer number (36398631).

Almost surely, 2^72797261 is an apocalyptic number.

It is an amenable number.

72797261 is a deficient number, since it is larger than the sum of its proper divisors (1).

72797261 is an equidigital number, since it uses as much as digits as its factorization.

72797261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 41.

The square root of 72797261 is about 8532.1310936952. The cubic root of 72797261 is about 417.5466590615.

It can be divided in two parts, 7279726 and 1, that added together give a palindrome (7279727).

The spelling of 72797261 in words is "seventy-two million, seven hundred ninety-seven thousand, two hundred sixty-one".