31103011121 has 24 divisors (see below), whose sum is σ = 39012327144. Its totient is φ = 24578588160.

The previous prime is 31103011117. The next prime is 31103011127. The reversal of 31103011121 is 12111030113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 917423521 + 30185587600 = 30289^2 + 173740^2 .

It is not a de Polignac number, because 31103011121 - 2² = 31103011117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31103011096 and 31103011105.

It is not an unprimeable number, because it can be changed into a prime (31103011127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 493241 + ... + 552713.

It is an arithmetic number, because the mean of its divisors is an integer number (1625513631).

Almost surely, 2^31103011121 is an apocalyptic number.

It is an amenable number.

31103011121 is a deficient number, since it is larger than the sum of its proper divisors (7909316023).

31103011121 is a wasteful number, since it uses less digits than its factorization.

31103011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60321 (or 60314 counting only the distinct ones).

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

Adding to 31103011121 its reverse (12111030113), we get a palindrome (43214041234).

The spelling of 31103011121 in words is "thirty-one billion, one hundred three million, eleven thousand, one hundred twenty-one".