1981115 has 8 divisors (see below), whose sum is σ = 2401488. Its totient is φ = 1568800.

The previous prime is 1981099. The next prime is 1981141. The reversal of 1981115 is 5111891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1981115 - 2⁴ = 1981099 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1457 + ... + 2466.

It is an arithmetic number, because the mean of its divisors is an integer number (300186).

2^1981115 is an apocalyptic number.

1981115 is a deficient number, since it is larger than the sum of its proper divisors (420373).

1981115 is a wasteful number, since it uses less digits than its factorization.

1981115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029.

The product of its digits is 360, while the sum is 26.

The square root of 1981115 is about 1407.5208701827. The cubic root of 1981115 is about 125.5942900767.

The spelling of 1981115 in words is "one million, nine hundred eighty-one thousand, one hundred fifteen".