31010311121 has 4 divisors (see below), whose sum is σ = 31035544500. Its totient is φ = 30985077744.

The previous prime is 31010311109. The next prime is 31010311139. The reversal of 31010311121 is 12111301013.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12111301013 = 7 ⋅1730185859.

It can be written as a sum of positive squares in 2 ways, for example, as 30011751121 + 998560000 = 173239^2 + 31600^2 .

It is a cyclic number.

It is not a de Polignac number, because 31010311121 - 2¹⁴ = 31010294737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31010311096 and 31010311105.

It is not an unprimeable number, because it can be changed into a prime (31010311621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12614846 + ... + 12617303.

It is an arithmetic number, because the mean of its divisors is an integer number (7758886125).

Almost surely, 2^31010311121 is an apocalyptic number.

It is an amenable number.

31010311121 is a deficient number, since it is larger than the sum of its proper divisors (25233379).

31010311121 is a wasteful number, since it uses less digits than its factorization.

31010311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25233378.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 31010311121 its reverse (12111301013), we get a palindrome (43121612134).

The spelling of 31010311121 in words is "thirty-one billion, ten million, three hundred eleven thousand, one hundred twenty-one".