31231430213131 has 8 divisors (see below), whose sum is σ = 32757980857920. Its totient is φ = 29740798407168.

The previous prime is 31231430213051. The next prime is 31231430213143. The reversal of 31231430213131 is 13131203413213.

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 31231430213131 - 2⁷ = 31231430213003 is a prime.

It is a super-2 number, since 2×31231430213131² (a number of 28 digits) 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 31231430213131.

It is not an unprimeable number, because it can be changed into a prime (31231430213231) 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, 8979707926 + ... + 8979711403.

It is an arithmetic number, because the mean of its divisors is an integer number (4094747607240).

Almost surely, 2^{31231430213131} is an apocalyptic number.

31231430213131 is a deficient number, since it is larger than the sum of its proper divisors (1526550644789).

31231430213131 is a wasteful number, since it uses less digits than its factorization.

31231430213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17959419413.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 31231430213131 its reverse (13131203413213), we get a palindrome (44362633626344).

The spelling of 31231430213131 in words is "thirty-one trillion, two hundred thirty-one billion, four hundred thirty million, two hundred thirteen thousand, one hundred thirty-one".