31279543849 has 8 divisors (see below), whose sum is σ = 32150024640. Its totient is φ = 30410383536.

The previous prime is 31279543843. The next prime is 31279543853. The reversal of 31279543849 is 94834597213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31279543849 - 2⁵ = 31279543817 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 31279543849.

It is not an unprimeable number, because it can be changed into a prime (31279543843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281989 + ... + 376930.

It is an arithmetic number, because the mean of its divisors is an integer number (4018753080).

Almost surely, 2^31279543849 is an apocalyptic number.

It is an amenable number.

31279543849 is a deficient number, since it is larger than the sum of its proper divisors (870480791).

31279543849 is a wasteful number, since it uses less digits than its factorization.

31279543849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660239.

The product of its digits is 6531840, while the sum is 55.

It can be divided in two parts, 31279 and 543849, that added together give a triangular number (575128 = T₁₀₇₂).

The spelling of 31279543849 in words is "thirty-one billion, two hundred seventy-nine million, five hundred forty-three thousand, eight hundred forty-nine".