261203523 has 8 divisors (see below), whose sum is σ = 398024448. Its totient is φ = 149259144.

The previous prime is 261203513. The next prime is 261203539. The reversal of 261203523 is 325302162.

261203523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261203523 - 2⁵ = 261203491 is a prime.

It is a super-2 number, since 2×261203523² = 136454560855223058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261203493 and 261203502.

It is not an unprimeable number, because it can be changed into a prime (261203513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6219111 + ... + 6219152.

It is an arithmetic number, because the mean of its divisors is an integer number (49753056).

Almost surely, 2^261203523 is an apocalyptic number.

261203523 is a deficient number, since it is larger than the sum of its proper divisors (136820925).

261203523 is a wasteful number, since it uses less digits than its factorization.

261203523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12438273.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 261203523 is about 16161.7920726632. The cubic root of 261203523 is about 639.2337207494.

Adding to 261203523 its reverse (325302162), we get a palindrome (586505685).

It can be divided in two parts, 261203 and 523, that added together give a triangular number (261726 = T₇₂₃).

The spelling of 261203523 in words is "two hundred sixty-one million, two hundred three thousand, five hundred twenty-three".