1985181 has 16 divisors (see below), whose sum is σ = 2956800. Its totient is φ = 1174320.

The previous prime is 1985167. The next prime is 1985183. The reversal of 1985181 is 1815891.

It is not a de Polignac number, because 1985181 - 2¹⁴ = 1968797 is a prime.

It is a super-2 number, since 2×1985181² = 7881887205522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720 + ... + 2118.

It is an arithmetic number, because the mean of its divisors is an integer number (184800).

2^1985181 is an apocalyptic number.

1985181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1985181 is a deficient number, since it is larger than the sum of its proper divisors (971619).

1985181 is a wasteful number, since it uses less digits than its factorization.

1985181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456.

The product of its digits is 2880, while the sum is 33.

The square root of 1985181 is about 1408.9645133927. The cubic root of 1985181 is about 125.6801537479.

The spelling of 1985181 in words is "one million, nine hundred eighty-five thousand, one hundred eighty-one".