42644051 has 2 divisors, whose sum is σ = 42644052. Its totient is φ = 42644050.

The previous prime is 42644039. The next prime is 42644057. The reversal of 42644051 is 15044624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42644051 - 2¹⁴ = 42627667 is a prime.

It is a Sophie Germain prime.

It is equal to p_2584340 and since 42644051 and 2584340 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42644051.

It is not a weakly prime, because it can be changed into another prime (42644057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21322025 + 21322026.

It is an arithmetic number, because the mean of its divisors is an integer number (21322026).

Almost surely, 2^42644051 is an apocalyptic number.

42644051 is a deficient number, since it is larger than the sum of its proper divisors (1).

42644051 is an equidigital number, since it uses as much as digits as its factorization.

42644051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 42644051 is about 6530.2412665996. The cubic root of 42644051 is about 349.3704355935.

Adding to 42644051 its reverse (15044624), we get a palindrome (57688675).

The spelling of 42644051 in words is "forty-two million, six hundred forty-four thousand, fifty-one".