420532531 has 16 divisors (see below), whose sum is σ = 438939648. Its totient is φ = 402587200.

The previous prime is 420532523. The next prime is 420532549. The reversal of 420532531 is 135235024.

It is not a de Polignac number, because 420532531 - 2³ = 420532523 is a prime.

It is a super-2 number, since 2×420532531² = 353695219258531922, 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 = 420532496 and 420532505.

It is not an unprimeable number, because it can be changed into a prime (420532501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649650 + ... + 650296.

It is an arithmetic number, because the mean of its divisors is an integer number (27433728).

Almost surely, 2^420532531 is an apocalyptic number.

420532531 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

420532531 is a deficient number, since it is larger than the sum of its proper divisors (18407117).

420532531 is a wasteful number, since it uses less digits than its factorization.

420532531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 420532531 is about 20506.8898421969. The cubic root of 420532531 is about 749.2036174806.

Adding to 420532531 its reverse (135235024), we get a palindrome (555767555).

The spelling of 420532531 in words is "four hundred twenty million, five hundred thirty-two thousand, five hundred thirty-one".