9871949 has 2 divisors, whose sum is σ = 9871950. Its totient is φ = 9871948.

The previous prime is 9871943. The next prime is 9871957. The reversal of 9871949 is 9491789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8514724 + 1357225 = 2918^2 + 1165^2 .

It is an emirp because it is prime and its reverse (9491789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9871949 - 2¹² = 9867853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9871943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4935974 + 4935975.

It is an arithmetic number, because the mean of its divisors is an integer number (4935975).

Almost surely, 2^9871949 is an apocalyptic number.

It is an amenable number.

9871949 is a deficient number, since it is larger than the sum of its proper divisors (1).

9871949 is an equidigital number, since it uses as much as digits as its factorization.

9871949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 9871949 is about 3141.9657859372. The cubic root of 9871949 is about 214.5199239629.

The spelling of 9871949 in words is "nine million, eight hundred seventy-one thousand, nine hundred forty-nine".