1981123 has 4 divisors (see below), whose sum is σ = 2010760. Its totient is φ = 1951488.

The previous prime is 1981099. The next prime is 1981141. The reversal of 1981123 is 3211891.

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 1981123 - 2¹³ = 1972931 is a prime.

It is a super-2 number, since 2×1981123² = 7849696682258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981153) 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, 14718 + ... + 14851.

It is an arithmetic number, because the mean of its divisors is an integer number (502690).

2^1981123 is an apocalyptic number.

1981123 is a deficient number, since it is larger than the sum of its proper divisors (29637).

1981123 is an equidigital number, since it uses as much as digits as its factorization.

1981123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29636.

The product of its digits is 432, while the sum is 25.

The square root of 1981123 is about 1407.5237120560. The cubic root of 1981123 is about 125.5944591319.

The spelling of 1981123 in words is "one million, nine hundred eighty-one thousand, one hundred twenty-three".