142649569 has 4 divisors (see below), whose sum is σ = 147251200. Its totient is φ = 138047940.

The previous prime is 142649543. The next prime is 142649609. The reversal of 142649569 is 965946241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 965946241 = 13 ⋅74303557.

It is a cyclic number.

It is not a de Polignac number, because 142649569 - 2¹⁵ = 142616801 is a prime.

It is a super-2 number, since 2×142649569² = 40697799071771522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142649069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2300769 + ... + 2300830.

It is an arithmetic number, because the mean of its divisors is an integer number (36812800).

Almost surely, 2^142649569 is an apocalyptic number.

It is an amenable number.

142649569 is a deficient number, since it is larger than the sum of its proper divisors (4601631).

142649569 is an equidigital number, since it uses as much as digits as its factorization.

142649569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601630.

The product of its digits is 466560, while the sum is 46.

The square root of 142649569 is about 11943.5994993134. The cubic root of 142649569 is about 522.5046437779.

The spelling of 142649569 in words is "one hundred forty-two million, six hundred forty-nine thousand, five hundred sixty-nine".