31131321441 has 16 divisors (see below), whose sum is σ = 45292827648. Its totient is φ = 18862923600.

The previous prime is 31131321437. The next prime is 31131321449. The reversal of 31131321441 is 14412313113.

It is a happy number.

It is not a de Polignac number, because 31131321441 - 2² = 31131321437 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31131321449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28140 + ... + 251106.

It is an arithmetic number, because the mean of its divisors is an integer number (2830801728).

Almost surely, 2^31131321441 is an apocalyptic number.

It is an amenable number.

31131321441 is a deficient number, since it is larger than the sum of its proper divisors (14161506207).

31131321441 is a wasteful number, since it uses less digits than its factorization.

31131321441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227212.

The product of its digits is 864, while the sum is 24.

Adding to 31131321441 its reverse (14412313113), we get a palindrome (45543634554).

The spelling of 31131321441 in words is "thirty-one billion, one hundred thirty-one million, three hundred twenty-one thousand, four hundred forty-one".