1113181 has 2 divisors, whose sum is σ = 1113182. Its totient is φ = 1113180.

The previous prime is 1113173. The next prime is 1113187. The reversal of 1113181 is 1813111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 902500 + 210681 = 950^2 + 459^2 .

It is a cyclic number.

It is not a de Polignac number, because 1113181 - 2³ = 1113173 is a prime.

It is a super-2 number, since 2×1113181² = 2478343877522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1113187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556590 + 556591.

It is an arithmetic number, because the mean of its divisors is an integer number (556591).

2^1113181 is an apocalyptic number.

It is an amenable number.

1113181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1113181 is an equidigital number, since it uses as much as digits as its factorization.

1113181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 16.

The square root of 1113181 is about 1055.0739310589. The cubic root of 1113181 is about 103.6386932286.

Adding to 1113181 its reverse (1813111), we get a palindrome (2926292).

It can be divided in two parts, 11 and 13181, that multiplied together give a triangular number (144991 = T₅₃₈).

The spelling of 1113181 in words is "one million, one hundred thirteen thousand, one hundred eighty-one".