72415261 has 2 divisors, whose sum is σ = 72415262. Its totient is φ = 72415260.

The previous prime is 72415249. The next prime is 72415313. The reversal of 72415261 is 16251427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67980025 + 4435236 = 8245^2 + 2106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72415261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72415241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36207630 + 36207631.

It is an arithmetic number, because the mean of its divisors is an integer number (36207631).

Almost surely, 2^72415261 is an apocalyptic number.

It is an amenable number.

72415261 is a deficient number, since it is larger than the sum of its proper divisors (1).

72415261 is an equidigital number, since it uses as much as digits as its factorization.

72415261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 72415261 is about 8509.7156826771. The cubic root of 72415261 is about 416.8150260663.

Adding to 72415261 its reverse (16251427), we get a palindrome (88666688).

The spelling of 72415261 in words is "seventy-two million, four hundred fifteen thousand, two hundred sixty-one".