261144007 has 2 divisors, whose sum is σ = 261144008. Its totient is φ = 261144006.

The previous prime is 261143983. The next prime is 261144011. The reversal of 261144007 is 700441162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261144007 - 2¹⁹ = 260619719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261144077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130572003 + 130572004.

It is an arithmetic number, because the mean of its divisors is an integer number (130572004).

Almost surely, 2^261144007 is an apocalyptic number.

261144007 is a deficient number, since it is larger than the sum of its proper divisors (1).

261144007 is an equidigital number, since it uses as much as digits as its factorization.

261144007 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 261144007 is about 16159.9507115585. The cubic root of 261144007 is about 639.1851666263.

Adding to 261144007 its reverse (700441162), we get a palindrome (961585169).

The spelling of 261144007 in words is "two hundred sixty-one million, one hundred forty-four thousand, seven".