31087859849 has 2 divisors, whose sum is σ = 31087859850. Its totient is φ = 31087859848.

The previous prime is 31087859833. The next prime is 31087859899. The reversal of 31087859849 is 94895878013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30019027600 + 1068832249 = 173260^2 + 32693^2 .

It is an emirp because it is prime and its reverse (94895878013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31087859849 - 2⁴ = 31087859833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31087859791 and 31087859800.

It is not a weakly prime, because it can be changed into another prime (31087859899) 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, 15543929924 + 15543929925.

It is an arithmetic number, because the mean of its divisors is an integer number (15543929925).

Almost surely, 2^31087859849 is an apocalyptic number.

It is an amenable number.

31087859849 is a deficient number, since it is larger than the sum of its proper divisors (1).

31087859849 is an equidigital number, since it uses as much as digits as its factorization.

31087859849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 31087859849 in words is "thirty-one billion, eighty-seven million, eight hundred fifty-nine thousand, eight hundred forty-nine".