420525431 has 2 divisors, whose sum is σ = 420525432. Its totient is φ = 420525430.

The previous prime is 420525421. The next prime is 420525437. The reversal of 420525431 is 134525024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420525431 - 2⁶ = 420525367 is a prime.

It is a super-2 number, since 2×420525431² = 353683276235471522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 420525431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420525437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210262715 + 210262716.

It is an arithmetic number, because the mean of its divisors is an integer number (210262716).

Almost surely, 2^420525431 is an apocalyptic number.

420525431 is a deficient number, since it is larger than the sum of its proper divisors (1).

420525431 is an equidigital number, since it uses as much as digits as its factorization.

420525431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 420525431 is about 20506.7167289159. The cubic root of 420525431 is about 749.1994011000.

The spelling of 420525431 in words is "four hundred twenty million, five hundred twenty-five thousand, four hundred thirty-one".