1181995 has 4 divisors (see below), whose sum is σ = 1418400. Its totient is φ = 945592.

The previous prime is 1181987. The next prime is 1182007. The reversal of 1181995 is 5991811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1181995 - 2³ = 1181987 is a prime.

It is a super-2 number, since 2×1181995² = 2794224360050, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1181995.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118195 + ... + 118204.

It is an arithmetic number, because the mean of its divisors is an integer number (354600).

2^1181995 is an apocalyptic number.

1181995 is a deficient number, since it is larger than the sum of its proper divisors (236405).

1181995 is an equidigital number, since it uses as much as digits as its factorization.

1181995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236404.

The product of its digits is 3240, while the sum is 34.

The square root of 1181995 is about 1087.1959345031. The cubic root of 1181995 is about 105.7316995384.

The spelling of 1181995 in words is "one million, one hundred eighty-one thousand, nine hundred ninety-five".