31143325061 has 2 divisors, whose sum is σ = 31143325062. Its totient is φ = 31143325060.

The previous prime is 31143325001. The next prime is 31143325141. The reversal of 31143325061 is 16052334113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18732028225 + 12411296836 = 136865^2 + 111406^2 .

It is an emirp because it is prime and its reverse (16052334113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31143325061 - 2³⁰ = 30069583237 is a prime.

It is a super-2 number, since 2×31143325061² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31143325001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571662530 + 15571662531.

It is an arithmetic number, because the mean of its divisors is an integer number (15571662531).

Almost surely, 2^31143325061 is an apocalyptic number.

It is an amenable number.

31143325061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143325061 is an equidigital number, since it uses as much as digits as its factorization.

31143325061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 31143325061 its reverse (16052334113), we get a palindrome (47195659174).

The spelling of 31143325061 in words is "thirty-one billion, one hundred forty-three million, three hundred twenty-five thousand, sixty-one".