42812569 has 4 divisors (see below), whose sum is σ = 43856820. Its totient is φ = 41768320.

The previous prime is 42812551. The next prime is 42812593. The reversal of 42812569 is 96521824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14722569 + 28090000 = 3837^2 + 5300^2 .

It is a cyclic number.

It is not a de Polignac number, because 42812569 - 2²¹ = 40715417 is a prime.

It is a super-2 number, since 2×42812569² = 3665832128759522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42812369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522064 + ... + 522145.

It is an arithmetic number, because the mean of its divisors is an integer number (10964205).

Almost surely, 2^42812569 is an apocalyptic number.

It is an amenable number.

42812569 is a deficient number, since it is larger than the sum of its proper divisors (1044251).

42812569 is a wasteful number, since it uses less digits than its factorization.

42812569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044250.

The product of its digits is 34560, while the sum is 37.

The square root of 42812569 is about 6543.1314368580. The cubic root of 42812569 is about 349.8300372060.

The spelling of 42812569 in words is "forty-two million, eight hundred twelve thousand, five hundred sixty-nine".