42644137 has 2 divisors, whose sum is σ = 42644138. Its totient is φ = 42644136.

The previous prime is 42644111. The next prime is 42644153. The reversal of 42644137 is 73144624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39891856 + 2752281 = 6316^2 + 1659^2 .

It is a cyclic number.

It is not a de Polignac number, because 42644137 - 2¹⁵ = 42611369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42644099 and 42644108.

It is not a weakly prime, because it can be changed into another prime (42644167) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21322068 + 21322069.

It is an arithmetic number, because the mean of its divisors is an integer number (21322069).

Almost surely, 2^42644137 is an apocalyptic number.

It is an amenable number.

42644137 is a deficient number, since it is larger than the sum of its proper divisors (1).

42644137 is an equidigital number, since it uses as much as digits as its factorization.

42644137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 31.

The square root of 42644137 is about 6530.2478513453. The cubic root of 42644137 is about 349.3706704511.

The spelling of 42644137 in words is "forty-two million, six hundred forty-four thousand, one hundred thirty-seven".