1964581 has 4 divisors (see below), whose sum is σ = 2068000. Its totient is φ = 1861164.

The previous prime is 1964579. The next prime is 1964593. The reversal of 1964581 is 1854691.

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: 1854691 = 223 ⋅8317.

It is not a de Polignac number, because 1964581 - 2¹ = 1964579 is a prime.

It is a super-2 number, since 2×1964581² = 7719157011122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

1964581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51681 + ... + 51718.

It is an arithmetic number, because the mean of its divisors is an integer number (517000).

2^1964581 is an apocalyptic number.

It is an amenable number.

1964581 is a deficient number, since it is larger than the sum of its proper divisors (103419).

1964581 is a wasteful number, since it uses less digits than its factorization.

1964581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103418.

The product of its digits is 8640, while the sum is 34.

The square root of 1964581 is about 1401.6351165692. The cubic root of 1964581 is about 125.2439183876.

The spelling of 1964581 in words is "one million, nine hundred sixty-four thousand, five hundred eighty-one".