1981149 has 8 divisors (see below), whose sum is σ = 2780640. Its totient is φ = 1251216.

The previous prime is 1981141. The next prime is 1981153. The reversal of 1981149 is 9411891.

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

It is not a de Polignac number, because 1981149 - 2³ = 1981141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17322 + ... + 17435.

It is an arithmetic number, because the mean of its divisors is an integer number (347580).

2^1981149 is an apocalyptic number.

1981149 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1981149 is a deficient number, since it is larger than the sum of its proper divisors (799491).

1981149 is a wasteful number, since it uses less digits than its factorization.

1981149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34779.

The product of its digits is 2592, while the sum is 33.

The square root of 1981149 is about 1407.5329481046. The cubic root of 1981149 is about 125.5950085579.

The spelling of 1981149 in words is "one million, nine hundred eighty-one thousand, one hundred forty-nine".