261207523 has 4 divisors (see below), whose sum is σ = 263519208. Its totient is φ = 258895840.

The previous prime is 261207503. The next prime is 261207559. The reversal of 261207523 is 325702162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261207523 - 2¹³ = 261199331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261207491 and 261207500.

It is not an unprimeable number, because it can be changed into a prime (261207503) 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 in 3 ways as a sum of consecutive naturals, for example, 1155673 + ... + 1155898.

It is an arithmetic number, because the mean of its divisors is an integer number (65879802).

Almost surely, 2^261207523 is an apocalyptic number.

261207523 is a deficient number, since it is larger than the sum of its proper divisors (2311685).

261207523 is a wasteful number, since it uses less digits than its factorization.

261207523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311684.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 261207523 is about 16161.9158208425. The cubic root of 261207523 is about 639.2369837501.

Adding to 261207523 its reverse (325702162), we get a palindrome (586909685).

The spelling of 261207523 in words is "two hundred sixty-one million, two hundred seven thousand, five hundred twenty-three".