1812481 has 4 divisors (see below), whose sum is σ = 1977264. Its totient is φ = 1647700.

The previous prime is 1812457. The next prime is 1812509. The reversal of 1812481 is 1842181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1842181 = 11 ⋅167471.

It is a cyclic number.

It is not a de Polignac number, because 1812481 - 2⁵ = 1812449 is a prime.

It is a super-2 number, since 2×1812481² = 6570174750722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812401) 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, 82375 + ... + 82396.

It is an arithmetic number, because the mean of its divisors is an integer number (494316).

It is a Proth number, since it is equal to 885 ⋅ 2¹¹ + 1 and 885 < 2¹¹.

2^1812481 is an apocalyptic number.

1812481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1812481 is a deficient number, since it is larger than the sum of its proper divisors (164783).

1812481 is a wasteful number, since it uses less digits than its factorization.

1812481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164782.

The product of its digits is 512, while the sum is 25.

The square root of 1812481 is about 1346.2841453423. The cubic root of 1812481 is about 121.9245479887.

It can be divided in two parts, 181 and 2481, that added together give a palindrome (2662).

The spelling of 1812481 in words is "one million, eight hundred twelve thousand, four hundred eighty-one".