2149646749 has 2 divisors, whose sum is σ = 2149646750. Its totient is φ = 2149646748.

The previous prime is 2149646743. The next prime is 2149646761. The reversal of 2149646749 is 9476469412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2143041849 + 6604900 = 46293^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149646749 - 2⁵ = 2149646717 is a prime.

It is a super-2 number, since 2×2149646749² = 9241962290972538002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2149646696 and 2149646705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2149646743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074823374 + 1074823375.

It is an arithmetic number, because the mean of its divisors is an integer number (1074823375).

Almost surely, 2^2149646749 is an apocalyptic number.

It is an amenable number.

2149646749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2149646749 is an equidigital number, since it uses as much as digits as its factorization.

2149646749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 52.

The square root of 2149646749 is about 46364.2831175033. The cubic root of 2149646749 is about 1290.5921902980.

The spelling of 2149646749 in words is "two billion, one hundred forty-nine million, six hundred forty-six thousand, seven hundred forty-nine".