4129981 has 2 divisors, whose sum is σ = 4129982. Its totient is φ = 4129980.

The previous prime is 4129943. The next prime is 4129987. The reversal of 4129981 is 1899214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3481956 + 648025 = 1866^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 4129981 - 2¹¹ = 4127933 is a prime.

It is a super-2 number, since 2×4129981² = 34113486120722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4129987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2064990 + 2064991.

It is an arithmetic number, because the mean of its divisors is an integer number (2064991).

Almost surely, 2^4129981 is an apocalyptic number.

It is an amenable number.

4129981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4129981 is an equidigital number, since it uses as much as digits as its factorization.

4129981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 4129981 is about 2032.2354686404. The cubic root of 4129981 is about 160.4412429729.

It can be divided in two parts, 41 and 29981, that multiplied together give a palindrome (1229221).

The spelling of 4129981 in words is "four million, one hundred twenty-nine thousand, nine hundred eighty-one".