261531123230 has 16 divisors (see below), whose sum is σ = 506968023744. Its totient is φ = 96565337760.

The previous prime is 261531123229. The next prime is 261531123239. The reversal of 261531123230 is 32321135162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261531123193 and 261531123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261531123239) 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, 1005888806 + ... + 1005889065.

It is an arithmetic number, because the mean of its divisors is an integer number (31685501484).

Almost surely, 2^261531123230 is an apocalyptic number.

261531123230 is a deficient number, since it is larger than the sum of its proper divisors (245436900514).

261531123230 is a wasteful number, since it uses less digits than its factorization.

261531123230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011777891.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 261531123230 its reverse (32321135162), we get a palindrome (293852258392).

The spelling of 261531123230 in words is "two hundred sixty-one billion, five hundred thirty-one million, one hundred twenty-three thousand, two hundred thirty".