43012129 has 2 divisors, whose sum is σ = 43012130. Its totient is φ = 43012128.

The previous prime is 43012127. The next prime is 43012141. The reversal of 43012129 is 92121034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42250000 + 762129 = 6500^2 + 873^2 .

It is a cyclic number.

It is not a de Polignac number, because 43012129 - 2¹ = 43012127 is a prime.

It is a super-2 number, since 2×43012129² = 3700086482225282, which contains 22 as substring.

Together with 43012127, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (43012127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21506064 + 21506065.

It is an arithmetic number, because the mean of its divisors is an integer number (21506065).

Almost surely, 2^43012129 is an apocalyptic number.

It is an amenable number.

43012129 is a deficient number, since it is larger than the sum of its proper divisors (1).

43012129 is an equidigital number, since it uses as much as digits as its factorization.

43012129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 43012129 is about 6558.3632866745. The cubic root of 43012129 is about 350.3727430312.

The spelling of 43012129 in words is "forty-three million, twelve thousand, one hundred twenty-nine".