129987941 has 2 divisors, whose sum is σ = 129987942. Its totient is φ = 129987940.

The previous prime is 129987901. The next prime is 129987983. The reversal of 129987941 is 149789921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103103716 + 26884225 = 10154^2 + 5185^2 .

It is a cyclic number.

It is not a de Polignac number, because 129987941 - 2²² = 125793637 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 129987941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129987901) 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, 64993970 + 64993971.

It is an arithmetic number, because the mean of its divisors is an integer number (64993971).

Almost surely, 2^129987941 is an apocalyptic number.

It is an amenable number.

129987941 is a deficient number, since it is larger than the sum of its proper divisors (1).

129987941 is an equidigital number, since it uses as much as digits as its factorization.

129987941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 50.

The square root of 129987941 is about 11401.2254165945. The cubic root of 129987941 is about 506.5640377216.

The spelling of 129987941 in words is "one hundred twenty-nine million, nine hundred eighty-seven thousand, nine hundred forty-one".