1518981 has 4 divisors (see below), whose sum is σ = 2025312. Its totient is φ = 1012652.

The previous prime is 1518977. The next prime is 1519039. The reversal of 1518981 is 1898151.

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: 1898151 = 3 ⋅632717.

It is a cyclic number.

It is not a de Polignac number, because 1518981 - 2² = 1518977 is a prime.

It is a super-2 number, since 2×1518981² = 4614606556722, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1518901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253161 + ... + 253166.

It is an arithmetic number, because the mean of its divisors is an integer number (506328).

2^1518981 is an apocalyptic number.

It is an amenable number.

1518981 is a deficient number, since it is larger than the sum of its proper divisors (506331).

1518981 is an equidigital number, since it uses as much as digits as its factorization.

1518981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506330.

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

The square root of 1518981 is about 1232.4694722386. The cubic root of 1518981 is about 114.9522422995.

The spelling of 1518981 in words is "one million, five hundred eighteen thousand, nine hundred eighty-one".