42444691 has 2 divisors, whose sum is σ = 42444692. Its totient is φ = 42444690.

The previous prime is 42444643. The next prime is 42444707. The reversal of 42444691 is 19644424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42444691 - 2²¹ = 40347539 is a prime.

It is not a weakly prime, because it can be changed into another prime (42444191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21222345 + 21222346.

It is an arithmetic number, because the mean of its divisors is an integer number (21222346).

Almost surely, 2^42444691 is an apocalyptic number.

42444691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42444691 is an equidigital number, since it uses as much as digits as its factorization.

42444691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 34.

The square root of 42444691 is about 6514.9590175227. The cubic root of 42444691 is about 348.8251519463.

The spelling of 42444691 in words is "forty-two million, four hundred forty-four thousand, six hundred ninety-one".