42644513 has 4 divisors (see below), whose sum is σ = 42835968. Its totient is φ = 42453060.

The previous prime is 42644501. The next prime is 42644521. The reversal of 42644513 is 31544624.

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.

It is a cyclic number.

It is not a de Polignac number, because 42644513 - 2⁸ = 42644257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42644543) 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, 95393 + ... + 95838.

It is an arithmetic number, because the mean of its divisors is an integer number (10708992).

Almost surely, 2^42644513 is an apocalyptic number.

It is an amenable number.

42644513 is a deficient number, since it is larger than the sum of its proper divisors (191455).

42644513 is a wasteful number, since it uses less digits than its factorization.

42644513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191454.

The product of its digits is 11520, while the sum is 29.

The square root of 42644513 is about 6530.2766403882. The cubic root of 42644513 is about 349.3716972666.

The spelling of 42644513 in words is "forty-two million, six hundred forty-four thousand, five hundred thirteen".