261002279 has 2 divisors, whose sum is σ = 261002280. Its totient is φ = 261002278.

The previous prime is 261002243. The next prime is 261002311. The reversal of 261002279 is 972200162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261002279 - 2¹² = 260998183 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261002219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130501139 + 130501140.

It is an arithmetic number, because the mean of its divisors is an integer number (130501140).

Almost surely, 2^261002279 is an apocalyptic number.

261002279 is a deficient number, since it is larger than the sum of its proper divisors (1).

261002279 is an equidigital number, since it uses as much as digits as its factorization.

261002279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 261002279 is about 16155.5649545288. The cubic root of 261002279 is about 639.0695129050.

The spelling of 261002279 in words is "two hundred sixty-one million, two thousand, two hundred seventy-nine".