1356231 has 4 divisors (see below), whose sum is σ = 1808312. Its totient is φ = 904152.

The previous prime is 1356227. The next prime is 1356247. The reversal of 1356231 is 1326531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1326531 = 3 ⋅442177.

It is not a de Polignac number, because 1356231 - 2² = 1356227 is a prime.

It is a super-2 number, since 2×1356231² = 3678725050722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

1356231 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1356198 and 1356207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356221) 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 in 3 ways as a sum of consecutive naturals, for example, 226036 + ... + 226041.

It is an arithmetic number, because the mean of its divisors is an integer number (452078).

2^1356231 is an apocalyptic number.

1356231 is a deficient number, since it is larger than the sum of its proper divisors (452081).

1356231 is an equidigital number, since it uses as much as digits as its factorization.

1356231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452080.

The product of its digits is 540, while the sum is 21.

The square root of 1356231 is about 1164.5733124196. The cubic root of 1356231 is about 110.6907225411.

It can be divided in two parts, 1356 and 231, that multiplied together give a triangular number (313236 = T₇₉₁).

The spelling of 1356231 in words is "one million, three hundred fifty-six thousand, two hundred thirty-one".