261440107 has 2 divisors, whose sum is σ = 261440108. Its totient is φ = 261440106.

The previous prime is 261440099. The next prime is 261440119. The reversal of 261440107 is 701044162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261440107 - 2³ = 261440099 is a prime.

It is not a weakly prime, because it can be changed into another prime (261440167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130720053 + 130720054.

It is an arithmetic number, because the mean of its divisors is an integer number (130720054).

Almost surely, 2^261440107 is an apocalyptic number.

261440107 is a deficient number, since it is larger than the sum of its proper divisors (1).

261440107 is an equidigital number, since it uses as much as digits as its factorization.

261440107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 261440107 is about 16169.1096539049. The cubic root of 261440107 is about 639.4266569350.

Adding to 261440107 its reverse (701044162), we get a palindrome (962484269).

The spelling of 261440107 in words is "two hundred sixty-one million, four hundred forty thousand, one hundred seven".