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421831 is a prime number
BaseRepresentation
bin1100110111111000111
3210102122101
41212333013
5101444311
613012531
73404554
oct1467707
9712571
10421831
11268a23
12184147
1311a007
14ada2b
1584ec1
hex66fc7

421831 has 2 divisors, whose sum is σ = 421832. Its totient is φ = 421830.

The previous prime is 421807. The next prime is 421847. The reversal of 421831 is 138124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421831 - 27 = 421703 is a prime.

It is a super-2 number, since 2×4218312 = 355882785122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 421799 and 421808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210915 + 210916.

It is an arithmetic number, because the mean of its divisors is an integer number (210916).

2421831 is an apocalyptic number.

421831 is a deficient number, since it is larger than the sum of its proper divisors (1).

421831 is an equidigital number, since it uses as much as digits as its factorization.

421831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 19.

The square root of 421831 is about 649.4851807393. The cubic root of 421831 is about 74.9973925019.

Adding to 421831 its reverse (138124), we get a palindrome (559955).

The spelling of 421831 in words is "four hundred twenty-one thousand, eight hundred thirty-one".