31320213431 has 8 divisors (see below), whose sum is σ = 33743913840. Its totient is φ = 28898577792.

The previous prime is 31320213413. The next prime is 31320213467. The reversal of 31320213431 is 13431202313.

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 31320213431 - 2⁶ = 31320213367 is a prime.

It is a super-2 number, since 2×31320213431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31320213397 and 31320213406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320213481) 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, 484610 + ... + 545423.

It is an arithmetic number, because the mean of its divisors is an integer number (4217989230).

Almost surely, 2^31320213431 is an apocalyptic number.

31320213431 is a deficient number, since it is larger than the sum of its proper divisors (2423700409).

31320213431 is a wasteful number, since it uses less digits than its factorization.

31320213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032385.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31320213431 its reverse (13431202313), we get a palindrome (44751415744).

The spelling of 31320213431 in words is "thirty-one billion, three hundred twenty million, two hundred thirteen thousand, four hundred thirty-one".