31313779849 has 9 divisors (see below), whose sum is σ = 34421418381. Its totient is φ = 28465303020.

The previous prime is 31313779843. The next prime is 31313779873. The reversal of 31313779849 is 94897731313.

The square root of 31313779849 is 176957.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 31313779849 - 2³ = 31313779841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31313779849.

It is not an unprimeable number, because it can be changed into a prime (31313779841) 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 8 ways as a sum of consecutive naturals, for example, 1938484 + ... + 1954570.

Almost surely, 2^31313779849 is an apocalyptic number.

31313779849 is the 176957-th square number.

31313779849 is the 88479-th centered octagonal number.

It is an amenable number.

31313779849 is a deficient number, since it is larger than the sum of its proper divisors (3107638532).

31313779849 is an frugal number, since it uses more digits than its factorization.

31313779849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32196 (or 16098 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 55.

The spelling of 31313779849 in words is "thirty-one billion, three hundred thirteen million, seven hundred seventy-nine thousand, eight hundred forty-nine".