142409569 has 4 divisors (see below), whose sum is σ = 145096596. Its totient is φ = 139722544.

The previous prime is 142409557. The next prime is 142409573. The reversal of 142409569 is 965904241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 965904241 = 31079².

It can be written as a sum of positive squares in 2 ways, for example, as 94965025 + 47444544 = 9745^2 + 6888^2 .

It is a cyclic number.

It is not a de Polignac number, because 142409569 - 2¹³ = 142401377 is a prime.

It is a super-2 number, since 2×142409569² = 40560970685531522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142409549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1343434 + ... + 1343539.

It is an arithmetic number, because the mean of its divisors is an integer number (36274149).

Almost surely, 2^142409569 is an apocalyptic number.

It is an amenable number.

142409569 is a deficient number, since it is larger than the sum of its proper divisors (2687027).

142409569 is an equidigital number, since it uses as much as digits as its factorization.

142409569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687026.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 142409569 is about 11933.5480474166. The cubic root of 142409569 is about 522.2114509138.

The spelling of 142409569 in words is "one hundred forty-two million, four hundred nine thousand, five hundred sixty-nine".