1981195 has 4 divisors (see below), whose sum is σ = 2377440. Its totient is φ = 1584952.

The previous prime is 1981181. The next prime is 1981201. The reversal of 1981195 is 5911891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5911891 = 103 ⋅57397.

It is a cyclic number.

It is not a de Polignac number, because 1981195 - 2¹¹ = 1979147 is a prime.

1981195 is a lucky number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1981195.

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, 198115 + ... + 198124.

It is an arithmetic number, because the mean of its divisors is an integer number (594360).

2^1981195 is an apocalyptic number.

1981195 is a deficient number, since it is larger than the sum of its proper divisors (396245).

1981195 is an equidigital number, since it uses as much as digits as its factorization.

1981195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396244.

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

The square root of 1981195 is about 1407.5492886574. The cubic root of 1981195 is about 125.5959806076.

The spelling of 1981195 in words is "one million, nine hundred eighty-one thousand, one hundred ninety-five".