261013523 has 2 divisors, whose sum is σ = 261013524. Its totient is φ = 261013522.

The previous prime is 261013481. The next prime is 261013547. The reversal of 261013523 is 325310162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261013523 is a prime.

It is not a weakly prime, because it can be changed into another prime (261093523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130506761 + 130506762.

It is an arithmetic number, because the mean of its divisors is an integer number (130506762).

Almost surely, 2^261013523 is an apocalyptic number.

261013523 is a deficient number, since it is larger than the sum of its proper divisors (1).

261013523 is an equidigital number, since it uses as much as digits as its factorization.

261013523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 261013523 is about 16155.9129423255. The cubic root of 261013523 is about 639.0786898292.

Adding to 261013523 its reverse (325310162), we get a palindrome (586323685).

The spelling of 261013523 in words is "two hundred sixty-one million, thirteen thousand, five hundred twenty-three".