1518641 has 4 divisors (see below), whose sum is σ = 1526784. Its totient is φ = 1510500.

The previous prime is 1518623. The next prime is 1518677. The reversal of 1518641 is 1468151.

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: 1468151 = 193 ⋅7607.

It is a cyclic number.

It is not a de Polignac number, because 1518641 - 2⁶ = 1518577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1518641.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1518691) 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, 3785 + ... + 4166.

It is an arithmetic number, because the mean of its divisors is an integer number (381696).

2^1518641 is an apocalyptic number.

It is an amenable number.

1518641 is a deficient number, since it is larger than the sum of its proper divisors (8143).

1518641 is an equidigital number, since it uses as much as digits as its factorization.

1518641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8142.

The product of its digits is 960, while the sum is 26.

The square root of 1518641 is about 1232.3315300681. The cubic root of 1518641 is about 114.9436649092.

The spelling of 1518641 in words is "one million, five hundred eighteen thousand, six hundred forty-one".