31321331431 has 8 divisors (see below), whose sum is σ = 33865053264. Its totient is φ = 28796808000.

The previous prime is 31321331407. The next prime is 31321331513. The reversal of 31321331431 is 13413312313.

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

It is a cyclic number.

It is not a de Polignac number, because 31321331431 - 2²³ = 31312942823 is a prime.

It is a super-2 number, since 2×31321331431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31321331396 and 31321331405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321331731) 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, 4796206 + ... + 4802731.

It is an arithmetic number, because the mean of its divisors is an integer number (4233131658).

Almost surely, 2^31321331431 is an apocalyptic number.

31321331431 is a deficient number, since it is larger than the sum of its proper divisors (2543721833).

31321331431 is a wasteful number, since it uses less digits than its factorization.

31321331431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9599201.

The product of its digits is 1944, while the sum is 25.

Adding to 31321331431 its reverse (13413312313), we get a palindrome (44734643744).

The spelling of 31321331431 in words is "thirty-one billion, three hundred twenty-one million, three hundred thirty-one thousand, four hundred thirty-one".