1968513 has 4 divisors (see below), whose sum is σ = 2624688. Its totient is φ = 1312340.

The previous prime is 1968487. The next prime is 1968521. The reversal of 1968513 is 3158691.

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: 3158691 = 3 ⋅1052897.

It is a cyclic number.

It is not a de Polignac number, because 1968513 - 2⁸ = 1968257 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1968563) 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, 328083 + ... + 328088.

It is an arithmetic number, because the mean of its divisors is an integer number (656172).

2^1968513 is an apocalyptic number.

It is an amenable number.

1968513 is a deficient number, since it is larger than the sum of its proper divisors (656175).

1968513 is an equidigital number, since it uses as much as digits as its factorization.

1968513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656174.

The product of its digits is 6480, while the sum is 33.

The square root of 1968513 is about 1403.0370629460. The cubic root of 1968513 is about 125.3274189591.

The spelling of 1968513 in words is "one million, nine hundred sixty-eight thousand, five hundred thirteen".