31293431 has 8 divisors (see below), whose sum is σ = 33814704. Its totient is φ = 28788480.

The previous prime is 31293389. The next prime is 31293439. The reversal of 31293431 is 13439213.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31293431 is a prime.

It is a super-2 number, since 2×31293431² = 1958557647503522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31293431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31293439) 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, 71 + ... + 7911.

It is an arithmetic number, because the mean of its divisors is an integer number (4226838).

Almost surely, 2^31293431 is an apocalyptic number.

31293431 is a deficient number, since it is larger than the sum of its proper divisors (2521273).

31293431 is a wasteful number, since it uses less digits than its factorization.

31293431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8161.

The product of its digits is 1944, while the sum is 26.

The square root of 31293431 is about 5594.0531817279. The cubic root of 31293431 is about 315.1261139432.

The spelling of 31293431 in words is "thirty-one million, two hundred ninety-three thousand, four hundred thirty-one".