4129891949 has 2 divisors, whose sum is σ = 4129891950. Its totient is φ = 4129891948.

The previous prime is 4129891933. The next prime is 4129891979. The reversal of 4129891949 is 9491989214.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3958674724 + 171217225 = 62918^2 + 13085^2 .

It is a cyclic number.

It is not a de Polignac number, because 4129891949 - 2⁴ = 4129891933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4129891894 and 4129891903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4129891979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2064945974 + 2064945975.

It is an arithmetic number, because the mean of its divisors is an integer number (2064945975).

Almost surely, 2^4129891949 is an apocalyptic number.

It is an amenable number.

4129891949 is a deficient number, since it is larger than the sum of its proper divisors (1).

4129891949 is an equidigital number, since it uses as much as digits as its factorization.

4129891949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 56.

The square root of 4129891949 is about 64264.2353801864. The cubic root of 4129891949 is about 1604.4008981539.

The spelling of 4129891949 in words is "four billion, one hundred twenty-nine million, eight hundred ninety-one thousand, nine hundred forty-nine".