31531202141 has 2 divisors, whose sum is σ = 31531202142. Its totient is φ = 31531202140.

The previous prime is 31531202137. The next prime is 31531202173. The reversal of 31531202141 is 14120213513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31168490116 + 362712025 = 176546^2 + 19045^2 .

It is a cyclic number.

It is not a de Polignac number, because 31531202141 - 2² = 31531202137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31531202111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15765601070 + 15765601071.

It is an arithmetic number, because the mean of its divisors is an integer number (15765601071).

Almost surely, 2^31531202141 is an apocalyptic number.

It is an amenable number.

31531202141 is a deficient number, since it is larger than the sum of its proper divisors (1).

31531202141 is an equidigital number, since it uses as much as digits as its factorization.

31531202141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 31531202141 its reverse (14120213513), we get a palindrome (45651415654).

The spelling of 31531202141 in words is "thirty-one billion, five hundred thirty-one million, two hundred two thousand, one hundred forty-one".