261031431134 has 16 divisors (see below), whose sum is σ = 408616012800. Its totient is φ = 124827345720.

The previous prime is 261031431131. The next prime is 261031431151. The reversal of 261031431134 is 431134130162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261031431097 and 261031431106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261031431131) 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, 114719 + ... + 731589.

It is an arithmetic number, because the mean of its divisors is an integer number (25538500800).

Almost surely, 2^261031431134 is an apocalyptic number.

261031431134 is a deficient number, since it is larger than the sum of its proper divisors (147584581666).

261031431134 is a wasteful number, since it uses less digits than its factorization.

261031431134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626095.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 261031431134 its reverse (431134130162), we get a palindrome (692165561296).

The spelling of 261031431134 in words is "two hundred sixty-one billion, thirty-one million, four hundred thirty-one thousand, one hundred thirty-four".