31448131861 has 2 divisors, whose sum is σ = 31448131862. Its totient is φ = 31448131860.

The previous prime is 31448131849. The next prime is 31448131879. The reversal of 31448131861 is 16813184413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31295732836 + 152399025 = 176906^2 + 12345^2 .

It is an emirp because it is prime and its reverse (16813184413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31448131861 - 2⁹ = 31448131349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31448131061) 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, 15724065930 + 15724065931.

It is an arithmetic number, because the mean of its divisors is an integer number (15724065931).

Almost surely, 2^31448131861 is an apocalyptic number.

It is an amenable number.

31448131861 is a deficient number, since it is larger than the sum of its proper divisors (1).

31448131861 is an equidigital number, since it uses as much as digits as its factorization.

31448131861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The spelling of 31448131861 in words is "thirty-one billion, four hundred forty-eight million, one hundred thirty-one thousand, eight hundred sixty-one".