247277281 has 2 divisors, whose sum is σ = 247277282. Its totient is φ = 247277280.

The previous prime is 247277279. The next prime is 247277311. The reversal of 247277281 is 182772742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213160000 + 34117281 = 14600^2 + 5841^2 .

It is a cyclic number.

It is not a de Polignac number, because 247277281 - 2¹ = 247277279 is a prime.

It is a super-2 number, since 2×247277281² = 122292107397505922, which contains 22 as substring.

Together with 247277279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (247277231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123638640 + 123638641.

It is an arithmetic number, because the mean of its divisors is an integer number (123638641).

Almost surely, 2^247277281 is an apocalyptic number.

It is an amenable number.

247277281 is a deficient number, since it is larger than the sum of its proper divisors (1).

247277281 is an equidigital number, since it uses as much as digits as its factorization.

247277281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87808, while the sum is 40.

The square root of 247277281 is about 15725.0526549198. The cubic root of 247277281 is about 627.6652314307.

The spelling of 247277281 in words is "two hundred forty-seven million, two hundred seventy-seven thousand, two hundred eighty-one".