261727247 has 2 divisors, whose sum is σ = 261727248. Its totient is φ = 261727246.

The previous prime is 261727241. The next prime is 261727309. The reversal of 261727247 is 742727162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261727247 - 2⁶ = 261727183 is a prime.

It is a super-4 number, since 4×261727247⁴ (a number of 35 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261727247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261727241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130863623 + 130863624.

It is an arithmetic number, because the mean of its divisors is an integer number (130863624).

Almost surely, 2^261727247 is an apocalyptic number.

261727247 is a deficient number, since it is larger than the sum of its proper divisors (1).

261727247 is an equidigital number, since it uses as much as digits as its factorization.

261727247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65856, while the sum is 38.

The square root of 261727247 is about 16177.9864939986. The cubic root of 261727247 is about 639.6606656537.

The spelling of 261727247 in words is "two hundred sixty-one million, seven hundred twenty-seven thousand, two hundred forty-seven".