31313100121 has 8 divisors (see below), whose sum is σ = 31750696040. Its totient is φ = 30875738112.

The previous prime is 31313100113. The next prime is 31313100127. The reversal of 31313100121 is 12100131313.

It can be written as a sum of positive squares in 4 ways, for example, as 1675756096 + 29637344025 = 40936^2 + 172155^2 .

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 31313100121 - 2³ = 31313100113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31313100095 and 31313100104.

It is not an unprimeable number, because it can be changed into a prime (31313100127) 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, 220345 + ... + 333433.

It is an arithmetic number, because the mean of its divisors is an integer number (3968837005).

Almost surely, 2^31313100121 is an apocalyptic number.

It is an amenable number.

31313100121 is a deficient number, since it is larger than the sum of its proper divisors (437595919).

31313100121 is a wasteful number, since it uses less digits than its factorization.

31313100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116955.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 31313100121 its reverse (12100131313), we get a palindrome (43413231434).

The spelling of 31313100121 in words is "thirty-one billion, three hundred thirteen million, one hundred thousand, one hundred twenty-one".