1381166 has 4 divisors (see below), whose sum is σ = 2071752. Its totient is φ = 690582.

The previous prime is 1381153. The next prime is 1381187. The reversal of 1381166 is 6611831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6611831 = 109 ⋅60659.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345290 + ... + 345293.

It is an arithmetic number, because the mean of its divisors is an integer number (517938).

2^1381166 is an apocalyptic number.

1381166 is a deficient number, since it is larger than the sum of its proper divisors (690586).

1381166 is an equidigital number, since it uses as much as digits as its factorization.

1381166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690585.

The product of its digits is 864, while the sum is 26.

The square root of 1381166 is about 1175.2301902181. The cubic root of 1381166 is about 111.3649756077.

Adding to 1381166 its reverse (6611831), we get a palindrome (7992997).

The spelling of 1381166 in words is "one million, three hundred eighty-one thousand, one hundred sixty-six".