420545131 has 4 divisors (see below), whose sum is σ = 426821992. Its totient is φ = 414268272.

The previous prime is 420545129. The next prime is 420545161. The reversal of 420545131 is 131545024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420545131 - 2¹ = 420545129 is a prime.

It is a super-2 number, since 2×420545131² = 353716414415614322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420545096 and 420545105.

It is not an unprimeable number, because it can be changed into a prime (420545161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3138330 + ... + 3138463.

It is an arithmetic number, because the mean of its divisors is an integer number (106705498).

Almost surely, 2^420545131 is an apocalyptic number.

420545131 is a deficient number, since it is larger than the sum of its proper divisors (6276861).

420545131 is an equidigital number, since it uses as much as digits as its factorization.

420545131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6276860.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 420545131 is about 20507.1970537175. The cubic root of 420545131 is about 749.2110999547.

The spelling of 420545131 in words is "four hundred twenty million, five hundred forty-five thousand, one hundred thirty-one".