31345431 has 8 divisors (see below), whose sum is σ = 45008880. Its totient is φ = 19289472.

The previous prime is 31345427. The next prime is 31345439. The reversal of 31345431 is 13454313.

It is a happy number.

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

It is not a de Polignac number, because 31345431 - 2² = 31345427 is a prime.

It is a super-2 number, since 2×31345431² = 1965072089151522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31345439) 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, 401826 + ... + 401903.

It is an arithmetic number, because the mean of its divisors is an integer number (5626110).

Almost surely, 2^31345431 is an apocalyptic number.

31345431 is a deficient number, since it is larger than the sum of its proper divisors (13663449).

31345431 is a wasteful number, since it uses less digits than its factorization.

31345431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803745.

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

The square root of 31345431 is about 5598.6990453140. The cubic root of 31345431 is about 315.3005647177.

Adding to 31345431 its reverse (13454313), we get a palindrome (44799744).

The spelling of 31345431 in words is "thirty-one million, three hundred forty-five thousand, four hundred thirty-one".