420551231 has 4 divisors (see below), whose sum is σ = 421610952. Its totient is φ = 419491512.

The previous prime is 420551203. The next prime is 420551269. The reversal of 420551231 is 132155024.

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 420551231 - 2²⁶ = 353442367 is a prime.

It is a super-2 number, since 2×420551231² = 353726675791230722, 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 = 420551197 and 420551206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420551281) 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, 529265 + ... + 530058.

It is an arithmetic number, because the mean of its divisors is an integer number (105402738).

Almost surely, 2^420551231 is an apocalyptic number.

420551231 is a deficient number, since it is larger than the sum of its proper divisors (1059721).

420551231 is a wasteful number, since it uses less digits than its factorization.

420551231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059720.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 420551231 is about 20507.3457814511. The cubic root of 420551231 is about 749.2147223686.

The spelling of 420551231 in words is "four hundred twenty million, five hundred fifty-one thousand, two hundred thirty-one".