261431706 has 16 divisors (see below), whose sum is σ = 523036800. Its totient is φ = 87115008.

The previous prime is 261431699. The next prime is 261431707. The reversal of 261431706 is 607134162.

261431706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261431707) 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, 20655 + ... + 30813.

It is an arithmetic number, because the mean of its divisors is an integer number (32689800).

Almost surely, 2^261431706 is an apocalyptic number.

261431706 is an abundant number, since it is smaller than the sum of its proper divisors (261605094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261431706 is a wasteful number, since it uses less digits than its factorization.

261431706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14453.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 261431706 is about 16168.8498663325. The cubic root of 261431706 is about 639.4198078445.

Adding to 261431706 its reverse (607134162), we get a palindrome (868565868).

The spelling of 261431706 in words is "two hundred sixty-one million, four hundred thirty-one thousand, seven hundred six".