1181431 has 4 divisors (see below), whose sum is σ = 1222200. Its totient is φ = 1140664.

The previous prime is 1181413. The next prime is 1181437. The reversal of 1181431 is 1341811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1341811 = 499 ⋅2689.

It is a cyclic number.

It is not a de Polignac number, because 1181431 - 2¹¹ = 1179383 is a prime.

It is a super-2 number, since 2×1181431² = 2791558415522, which contains 22 as substring.

It is a Duffinian number.

1181431 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1181399 and 1181408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181437) 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, 20341 + ... + 20398.

It is an arithmetic number, because the mean of its divisors is an integer number (305550).

2^1181431 is an apocalyptic number.

1181431 is a deficient number, since it is larger than the sum of its proper divisors (40769).

1181431 is an equidigital number, since it uses as much as digits as its factorization.

1181431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40768.

The product of its digits is 96, while the sum is 19.

The square root of 1181431 is about 1086.9365206855. The cubic root of 1181431 is about 105.7148799055.

The spelling of 1181431 in words is "one million, one hundred eighty-one thousand, four hundred thirty-one".