261431432 has 32 divisors (see below), whose sum is σ = 528007680. Its totient is φ = 120996480.

The previous prime is 261431399. The next prime is 261431453. The reversal of 261431432 is 234134162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17213 + ... + 28620.

It is an arithmetic number, because the mean of its divisors is an integer number (16500240).

Almost surely, 2^261431432 is an apocalyptic number.

It is an amenable number.

261431432 is an abundant number, since it is smaller than the sum of its proper divisors (266576248).

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

261431432 is a wasteful number, since it uses less digits than its factorization.

261431432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45893 (or 45889 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 261431432 is about 16168.8413932477. The cubic root of 261431432 is about 639.4195844578.

Adding to 261431432 its reverse (234134162), we get a palindrome (495565594).

The spelling of 261431432 in words is "two hundred sixty-one million, four hundred thirty-one thousand, four hundred thirty-two".