1811481 has 12 divisors (see below), whose sum is σ = 2809872. Its totient is φ = 1035048.

The previous prime is 1811473. The next prime is 1811489. The reversal of 1811481 is 1841181.

It is an interprime number because it is at equal distance from previous prime (1811473) and next prime (1811489).

It is not a de Polignac number, because 1811481 - 2³ = 1811473 is a prime.

It is a super-2 number, since 2×1811481² = 6562926826722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1811489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6015 + ... + 6308.

It is an arithmetic number, because the mean of its divisors is an integer number (234156).

2^1811481 is an apocalyptic number.

It is an amenable number.

1811481 is a deficient number, since it is larger than the sum of its proper divisors (998391).

1811481 is a wasteful number, since it uses less digits than its factorization.

1811481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12340 (or 12333 counting only the distinct ones).

The product of its digits is 256, while the sum is 24.

The square root of 1811481 is about 1345.9127014781. The cubic root of 1811481 is about 121.9021207231.

The spelling of 1811481 in words is "one million, eight hundred eleven thousand, four hundred eighty-one".