401242129 has 2 divisors, whose sum is σ = 401242130. Its totient is φ = 401242128.

The previous prime is 401242123. The next prime is 401242139. The reversal of 401242129 is 921242104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391129729 + 10112400 = 19777^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 401242129 - 2¹⁷ = 401111057 is a prime.

It is not a weakly prime, because it can be changed into another prime (401242123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200621064 + 200621065.

It is an arithmetic number, because the mean of its divisors is an integer number (200621065).

Almost surely, 2^401242129 is an apocalyptic number.

It is an amenable number.

401242129 is a deficient number, since it is larger than the sum of its proper divisors (1).

401242129 is an equidigital number, since it uses as much as digits as its factorization.

401242129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 401242129 is about 20031.0291547888. The cubic root of 401242129 is about 737.5681853648.

Subtracting from 401242129 its sum of digits (25), we obtain a palindrome (401242104).

The spelling of 401242129 in words is "four hundred one million, two hundred forty-two thousand, one hundred twenty-nine".