4001023129 has 2 divisors, whose sum is σ = 4001023130. Its totient is φ = 4001023128.

The previous prime is 4001023127. The next prime is 4001023139. The reversal of 4001023129 is 9213201004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3686918400 + 314104729 = 60720^2 + 17723^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001023129 - 2¹ = 4001023127 is a prime.

Together with 4001023127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4001023127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000511564 + 2000511565.

It is an arithmetic number, because the mean of its divisors is an integer number (2000511565).

Almost surely, 2^4001023129 is an apocalyptic number.

It is an amenable number.

4001023129 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001023129 is an equidigital number, since it uses as much as digits as its factorization.

4001023129 is an evil number, because the sum of its binary digits is even.

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

The square root of 4001023129 is about 63253.6412311576. The cubic root of 4001023129 is about 1587.5363834346.

The spelling of 4001023129 in words is "four billion, one million, twenty-three thousand, one hundred twenty-nine".