42644591 has 4 divisors (see below), whose sum is σ = 46521384. Its totient is φ = 38767800.

The previous prime is 42644579. The next prime is 42644593. The reversal of 42644591 is 19544624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42644591 - 2⁶ = 42644527 is a prime.

It is a super-2 number, since 2×42644591² = 3637122283114562, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42644593) 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, 1938380 + ... + 1938401.

It is an arithmetic number, because the mean of its divisors is an integer number (11630346).

Almost surely, 2^42644591 is an apocalyptic number.

42644591 is a deficient number, since it is larger than the sum of its proper divisors (3876793).

42644591 is a wasteful number, since it uses less digits than its factorization.

42644591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876792.

The product of its digits is 34560, while the sum is 35.

The square root of 42644591 is about 6530.2826125674. The cubic root of 42644591 is about 349.3719102755.

The spelling of 42644591 in words is "forty-two million, six hundred forty-four thousand, five hundred ninety-one".