31000431121 has 8 divisors (see below), whose sum is σ = 33928814304. Its totient is φ = 28090408320.

The previous prime is 31000431101. The next prime is 31000431131. The reversal of 31000431121 is 12113400013.

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 31000431121 - 2²³ = 30992042513 is a prime.

It is a super-2 number, since 2×31000431121² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000431095 and 31000431104.

It is not an unprimeable number, because it can be changed into a prime (31000431101) 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, 4586560 + ... + 4593313.

It is an arithmetic number, because the mean of its divisors is an integer number (4241101788).

Almost surely, 2^31000431121 is an apocalyptic number.

It is an amenable number.

31000431121 is a deficient number, since it is larger than the sum of its proper divisors (2928383183).

31000431121 is a wasteful number, since it uses less digits than its factorization.

31000431121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9180191.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31000431121 its reverse (12113400013), we get a palindrome (43113831134).

The spelling of 31000431121 in words is "thirty-one billion, four hundred thirty-one thousand, one hundred twenty-one".