31153852861 has 2 divisors, whose sum is σ = 31153852862. Its totient is φ = 31153852860.

The previous prime is 31153852841. The next prime is 31153852871. The reversal of 31153852861 is 16825835113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25117495225 + 6036357636 = 158485^2 + 77694^2 .

It is a cyclic number.

It is not a de Polignac number, because 31153852861 - 2¹³ = 31153844669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31153852801) 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 as a sum of consecutive naturals, namely, 15576926430 + 15576926431.

It is an arithmetic number, because the mean of its divisors is an integer number (15576926431).

Almost surely, 2^31153852861 is an apocalyptic number.

It is an amenable number.

31153852861 is a deficient number, since it is larger than the sum of its proper divisors (1).

31153852861 is an equidigital number, since it uses as much as digits as its factorization.

31153852861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 43.

The spelling of 31153852861 in words is "thirty-one billion, one hundred fifty-three million, eight hundred fifty-two thousand, eight hundred sixty-one".