42642497 has 2 divisors, whose sum is σ = 42642498. Its totient is φ = 42642496.

The previous prime is 42642491. The next prime is 42642521. The reversal of 42642497 is 79424624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41938576 + 703921 = 6476^2 + 839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42642497 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42642497.

It is not a weakly prime, because it can be changed into another prime (42642491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21321248 + 21321249.

It is an arithmetic number, because the mean of its divisors is an integer number (21321249).

Almost surely, 2^42642497 is an apocalyptic number.

It is an amenable number.

42642497 is a deficient number, since it is larger than the sum of its proper divisors (1).

42642497 is an equidigital number, since it uses as much as digits as its factorization.

42642497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 38.

The square root of 42642497 is about 6530.1222806315. The cubic root of 42642497 is about 349.3661917171.

The spelling of 42642497 in words is "forty-two million, six hundred forty-two thousand, four hundred ninety-seven".