31434431 has 6 divisors (see below), whose sum is σ = 36566640. Its totient is φ = 26943756.

The previous prime is 31434427. The next prime is 31434439. The reversal of 31434431 is 13443413.

It is not a de Polignac number, because 31434431 - 2² = 31434427 is a prime.

It is a super-2 number, since 2×31434431² = 1976246904587522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31434397 and 31434406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31434439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 320711 + ... + 320808.

It is an arithmetic number, because the mean of its divisors is an integer number (6094440).

Almost surely, 2^31434431 is an apocalyptic number.

31434431 is a deficient number, since it is larger than the sum of its proper divisors (5132209).

31434431 is an equidigital number, since it uses as much as digits as its factorization.

31434431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641533 (or 641526 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 31434431 is about 5606.6416864287. The cubic root of 31434431 is about 315.5986967722.

Adding to 31434431 its reverse (13443413), we get a palindrome (44877844).

The spelling of 31434431 in words is "thirty-one million, four hundred thirty-four thousand, four hundred thirty-one".