1645013 has 4 divisors (see below), whose sum is σ = 1661088. Its totient is φ = 1628940.

The previous prime is 1645009. The next prime is 1645019. The reversal of 1645013 is 3105461.

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: 3105461 = 107 ⋅29023.

It is a cyclic number.

It is not a de Polignac number, because 1645013 - 2² = 1645009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645019) 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, 7883 + ... + 8088.

It is an arithmetic number, because the mean of its divisors is an integer number (415272).

2^1645013 is an apocalyptic number.

It is an amenable number.

1645013 is a deficient number, since it is larger than the sum of its proper divisors (16075).

1645013 is a wasteful number, since it uses less digits than its factorization.

1645013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16074.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1645013 is about 1282.5806017557. The cubic root of 1645013 is about 118.0474050649.

The spelling of 1645013 in words is "one million, six hundred forty-five thousand, thirteen".