420129953 has 2 divisors, whose sum is σ = 420129954. Its totient is φ = 420129952.

The previous prime is 420129947. The next prime is 420129967. The reversal of 420129953 is 359921024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299393809 + 120736144 = 17303^2 + 10988^2 .

It is a cyclic number.

It is not a de Polignac number, because 420129953 - 2⁶ = 420129889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (420129053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210064976 + 210064977.

It is an arithmetic number, because the mean of its divisors is an integer number (210064977).

Almost surely, 2^420129953 is an apocalyptic number.

It is an amenable number.

420129953 is a deficient number, since it is larger than the sum of its proper divisors (1).

420129953 is an equidigital number, since it uses as much as digits as its factorization.

420129953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 420129953 is about 20497.0718152618. The cubic root of 420129953 is about 748.9644689661.

The spelling of 420129953 in words is "four hundred twenty million, one hundred twenty-nine thousand, nine hundred fifty-three".