1981411 has 4 divisors (see below), whose sum is σ = 2000752. Its totient is φ = 1962072.

The previous prime is 1981409. The next prime is 1981417. The reversal of 1981411 is 1141891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1141891 = 41 ⋅27851.

It is a cyclic number.

It is not a de Polignac number, because 1981411 - 2¹ = 1981409 is a prime.

It is a super-3 number, since 3×1981411³ = 23336996646239788593, which contains 333 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9516 + ... + 9721.

It is an arithmetic number, because the mean of its divisors is an integer number (500188).

2^1981411 is an apocalyptic number.

1981411 is a deficient number, since it is larger than the sum of its proper divisors (19341).

1981411 is a wasteful number, since it uses less digits than its factorization.

1981411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19340.

The product of its digits is 288, while the sum is 25.

The square root of 1981411 is about 1407.6260156732. The cubic root of 1981411 is about 125.6005448135.

It can be divided in two parts, 198 and 1411, that multiplied together give a triangular number (279378 = T₇₄₇).

The spelling of 1981411 in words is "one million, nine hundred eighty-one thousand, four hundred eleven".