247779241 has 2 divisors, whose sum is σ = 247779242. Its totient is φ = 247779240.

The previous prime is 247779227. The next prime is 247779271. The reversal of 247779241 is 142977742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244015641 + 3763600 = 15621^2 + 1940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247779241 is a prime.

It is a super-2 number, since 2×247779241² = 122789104541072162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247779271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123889620 + 123889621.

It is an arithmetic number, because the mean of its divisors is an integer number (123889621).

Almost surely, 2^247779241 is an apocalyptic number.

It is an amenable number.

247779241 is a deficient number, since it is larger than the sum of its proper divisors (1).

247779241 is an equidigital number, since it uses as much as digits as its factorization.

247779241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 43.

The square root of 247779241 is about 15741.0050822684. The cubic root of 247779241 is about 628.0896536169.

It can be divided in two parts, 2477 and 79241, that added together give a palindrome (81718).

The spelling of 247779241 in words is "two hundred forty-seven million, seven hundred seventy-nine thousand, two hundred forty-one".