261233523 has 6 divisors (see below), whose sum is σ = 377337324. Its totient is φ = 174155676.

The previous prime is 261233507. The next prime is 261233593. The reversal of 261233523 is 325332162.

It is not a de Polignac number, because 261233523 - 2⁴ = 261233507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261233503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14512965 + ... + 14512982.

It is an arithmetic number, because the mean of its divisors is an integer number (62889554).

Almost surely, 2^261233523 is an apocalyptic number.

261233523 is a deficient number, since it is larger than the sum of its proper divisors (116103801).

261233523 is a wasteful number, since it uses less digits than its factorization.

261233523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29025953 (or 29025950 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 261233523 is about 16162.7201609135. The cubic root of 261233523 is about 639.2581924427.

Adding to 261233523 its reverse (325332162), we get a palindrome (586565685).

It can be divided in two parts, 26123 and 3523, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 261233523 in words is "two hundred sixty-one million, two hundred thirty-three thousand, five hundred twenty-three".