420955231 has 4 divisors (see below), whose sum is σ = 434534464. Its totient is φ = 407376000.

The previous prime is 420955229. The next prime is 420955243. The reversal of 420955231 is 132559024.

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 420955231 - 2¹ = 420955229 is a prime.

It is a super-2 number, since 2×420955231² = 354406613012526722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 13579201 = 420955231 / (4 + 2 + 0 + 9 + 5 + 5 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420955193 and 420955202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420955211) 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, 6789570 + ... + 6789631.

It is an arithmetic number, because the mean of its divisors is an integer number (108633616).

Almost surely, 2^420955231 is an apocalyptic number.

420955231 is a deficient number, since it is larger than the sum of its proper divisors (13579233).

420955231 is a wasteful number, since it uses less digits than its factorization.

420955231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13579232.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 420955231 is about 20517.1935459019. The cubic root of 420955231 is about 749.4545551197.

The spelling of 420955231 in words is "four hundred twenty million, nine hundred fifty-five thousand, two hundred thirty-one".