1664513 has 4 divisors (see below), whose sum is σ = 1721940. Its totient is φ = 1607088.

The previous prime is 1664501. The next prime is 1664543. The reversal of 1664513 is 3154661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3154661 = 211 ⋅14951.

It can be written as a sum of positive squares in 2 ways, for example, as 394384 + 1270129 = 628^2 + 1127^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664513 - 2¹⁸ = 1402369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664543) 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, 28670 + ... + 28727.

It is an arithmetic number, because the mean of its divisors is an integer number (430485).

2^1664513 is an apocalyptic number.

It is an amenable number.

1664513 is a deficient number, since it is larger than the sum of its proper divisors (57427).

1664513 is an equidigital number, since it uses as much as digits as its factorization.

1664513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57426.

The product of its digits is 2160, while the sum is 26.

The square root of 1664513 is about 1290.1600675885. The cubic root of 1664513 is about 118.5120190531.

The spelling of 1664513 in words is "one million, six hundred sixty-four thousand, five hundred thirteen".