77281241 has 2 divisors, whose sum is σ = 77281242. Its totient is φ = 77281240.

The previous prime is 77281213. The next prime is 77281291. The reversal of 77281241 is 14218277.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64464841 + 12816400 = 8029^2 + 3580^2 .

It is a cyclic number.

It is not a de Polignac number, because 77281241 - 2²⁶ = 10172377 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77281198 and 77281207.

It is not a weakly prime, because it can be changed into another prime (77281291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38640620 + 38640621.

It is an arithmetic number, because the mean of its divisors is an integer number (38640621).

Almost surely, 2^77281241 is an apocalyptic number.

It is an amenable number.

77281241 is a deficient number, since it is larger than the sum of its proper divisors (1).

77281241 is an equidigital number, since it uses as much as digits as its factorization.

77281241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 32.

The square root of 77281241 is about 8790.9749743700. The cubic root of 77281241 is about 425.9494179769.

The spelling of 77281241 in words is "seventy-seven million, two hundred eighty-one thousand, two hundred forty-one".