1255831 has 2 divisors, whose sum is σ = 1255832. Its totient is φ = 1255830.
The previous prime is 1255829. The next prime is 1255847. The reversal of 1255831 is 1385521.
It is a happy number.
It is a weak prime.
It is an emirp because it is prime and its reverse (1385521) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 1255831 - 21 = 1255829 is a prime.
It is a super-2 number, since 2×12558312 = 3154223001122, which contains 22 as substring.
Together with 1255829, it forms a pair of twin primes.
1255831 is a lucky number.
It is a junction number, because it is equal to n+sod(n) for n = 1255796 and 1255805.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1255801) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627915 + 627916.
It is an arithmetic number, because the mean of its divisors is an integer number (627916).
21255831 is an apocalyptic number.
1255831 is a deficient number, since it is larger than the sum of its proper divisors (1).
1255831 is an equidigital number, since it uses as much as digits as its factorization.
1255831 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1200, while the sum is 25.
The square root of 1255831 is about 1120.6386571951. The cubic root of 1255831 is about 107.8889748387. Note that the first 3 decimals are identical.
The spelling of 1255831 in words is "one million, two hundred fifty-five thousand, eight hundred thirty-one".
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