420632531 has 4 divisors (see below), whose sum is σ = 458871864. Its totient is φ = 382393200.

The previous prime is 420632519. The next prime is 420632551. The reversal of 420632531 is 135236024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420632531 is a prime.

It is a super-2 number, since 2×420632531² = 353863452270931922, 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 420632531.

It is not an unprimeable number, because it can be changed into a prime (420632551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19119650 + ... + 19119671.

It is an arithmetic number, because the mean of its divisors is an integer number (114717966).

Almost surely, 2^420632531 is an apocalyptic number.

420632531 is a deficient number, since it is larger than the sum of its proper divisors (38239333).

420632531 is a wasteful number, since it uses less digits than its factorization.

420632531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38239332.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 420632531 is about 20509.3279022010. The cubic root of 420632531 is about 749.2629980822.

Adding to 420632531 its reverse (135236024), we get a palindrome (555868555).

The spelling of 420632531 in words is "four hundred twenty million, six hundred thirty-two thousand, five hundred thirty-one".