42645569 has 2 divisors, whose sum is σ = 42645570. Its totient is φ = 42645568.

The previous prime is 42645563. The next prime is 42645583. The reversal of 42645569 is 96554624.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 20367169 = 4720^2 + 4513^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42645569 is a prime.

It is a super-2 number, since 2×42645569² = 3637289110667522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42645563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21322784 + 21322785.

It is an arithmetic number, because the mean of its divisors is an integer number (21322785).

Almost surely, 2^42645569 is an apocalyptic number.

It is an amenable number.

42645569 is a deficient number, since it is larger than the sum of its proper divisors (1).

42645569 is an equidigital number, since it uses as much as digits as its factorization.

42645569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 41.

The square root of 42645569 is about 6530.3574940427. The cubic root of 42645569 is about 349.3745810567.

The spelling of 42645569 in words is "forty-two million, six hundred forty-five thousand, five hundred sixty-nine".