261040523 has 2 divisors, whose sum is σ = 261040524. Its totient is φ = 261040522.

The previous prime is 261040489. The next prime is 261040567. The reversal of 261040523 is 325040162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261040523 - 2¹² = 261036427 is a prime.

It is a super-2 number, since 2×261040523² = 136284309296227058, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (261040583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130520261 + 130520262.

It is an arithmetic number, because the mean of its divisors is an integer number (130520262).

Almost surely, 2^261040523 is an apocalyptic number.

261040523 is a deficient number, since it is larger than the sum of its proper divisors (1).

261040523 is an equidigital number, since it uses as much as digits as its factorization.

261040523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 261040523 is about 16156.7485280919. The cubic root of 261040523 is about 639.1007251239.

Adding to 261040523 its reverse (325040162), we get a palindrome (586080685).

The spelling of 261040523 in words is "two hundred sixty-one million, forty thousand, five hundred twenty-three".