1161231 has 4 divisors (see below), whose sum is σ = 1548312. Its totient is φ = 774152.

The previous prime is 1161227. The next prime is 1161233. The reversal of 1161231 is 1321611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321611 = 3 ⋅440537.

It is a cyclic number.

It is not a de Polignac number, because 1161231 - 2² = 1161227 is a prime.

It is a super-2 number, since 2×1161231² = 2696914870722, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161233) 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, 193536 + ... + 193541.

It is an arithmetic number, because the mean of its divisors is an integer number (387078).

2^1161231 is an apocalyptic number.

1161231 is a deficient number, since it is larger than the sum of its proper divisors (387081).

1161231 is an equidigital number, since it uses as much as digits as its factorization.

1161231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387080.

The product of its digits is 36, while the sum is 15.

The square root of 1161231 is about 1077.6042872966. The cubic root of 1161231 is about 105.1089119346.

Adding to 1161231 its reverse (1321611), we get a palindrome (2482842).

The spelling of 1161231 in words is "one million, one hundred sixty-one thousand, two hundred thirty-one".