261008873 has 2 divisors, whose sum is σ = 261008874. Its totient is φ = 261008872.

The previous prime is 261008857. The next prime is 261008879. The reversal of 261008873 is 378800162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235070224 + 25938649 = 15332^2 + 5093^2 .

It is a cyclic number.

It is not a de Polignac number, because 261008873 - 2⁴ = 261008857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (261008879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130504436 + 130504437.

It is an arithmetic number, because the mean of its divisors is an integer number (130504437).

Almost surely, 2^261008873 is an apocalyptic number.

It is an amenable number.

261008873 is a deficient number, since it is larger than the sum of its proper divisors (1).

261008873 is an equidigital number, since it uses as much as digits as its factorization.

261008873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 261008873 is about 16155.7690315255. The cubic root of 261008873 is about 639.0748947084.

The spelling of 261008873 in words is "two hundred sixty-one million, eight thousand, eight hundred seventy-three".