31860784649 has 2 divisors, whose sum is σ = 31860784650. Its totient is φ = 31860784648.

The previous prime is 31860784643. The next prime is 31860784667. The reversal of 31860784649 is 94648706813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29316288400 + 2544496249 = 171220^2 + 50443^2 .

It is a cyclic number.

It is not a de Polignac number, because 31860784649 - 2¹⁶ = 31860719113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31860784594 and 31860784603.

It is not a weakly prime, because it can be changed into another prime (31860784643) 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 as a sum of consecutive naturals, namely, 15930392324 + 15930392325.

It is an arithmetic number, because the mean of its divisors is an integer number (15930392325).

Almost surely, 2^31860784649 is an apocalyptic number.

It is an amenable number.

31860784649 is a deficient number, since it is larger than the sum of its proper divisors (1).

31860784649 is an equidigital number, since it uses as much as digits as its factorization.

31860784649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 56.

The spelling of 31860784649 in words is "thirty-one billion, eight hundred sixty million, seven hundred eighty-four thousand, six hundred forty-nine".