406621129 has 2 divisors, whose sum is σ = 406621130. Its totient is φ = 406621128.

The previous prime is 406621123. The next prime is 406621183. The reversal of 406621129 is 921126604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359671225 + 46949904 = 18965^2 + 6852^2 .

It is a cyclic number.

It is not a de Polignac number, because 406621129 - 2⁷ = 406621001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 406621129.

It is not a weakly prime, because it can be changed into another prime (406621123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203310564 + 203310565.

It is an arithmetic number, because the mean of its divisors is an integer number (203310565).

Almost surely, 2^406621129 is an apocalyptic number.

It is an amenable number.

406621129 is a deficient number, since it is larger than the sum of its proper divisors (1).

406621129 is an equidigital number, since it uses as much as digits as its factorization.

406621129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 406621129 is about 20164.8488464456. The cubic root of 406621129 is about 740.8494803977.

The spelling of 406621129 in words is "four hundred six million, six hundred twenty-one thousand, one hundred twenty-nine".