142569981 has 12 divisors (see below), whose sum is σ = 206038560. Its totient is φ = 94998600.

The previous prime is 142569971. The next prime is 142569989. The reversal of 142569981 is 189965241.

142569981 is a `hidden beast` number, since 1 + 4 + 2 + 569 + 9 + 81 = 666.

It is not a de Polignac number, because 142569981 - 2⁷ = 142569853 is a prime.

It is a super-2 number, since 2×142569981² = 40652398964680722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142569989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29806 + ... + 34256.

It is an arithmetic number, because the mean of its divisors is an integer number (17169880).

Almost surely, 2^142569981 is an apocalyptic number.

It is an amenable number.

142569981 is a deficient number, since it is larger than the sum of its proper divisors (63468579).

142569981 is a wasteful number, since it uses less digits than its factorization.

142569981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8016 (or 8013 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 142569981 is about 11940.2672080653. The cubic root of 142569981 is about 522.4074526073.

The spelling of 142569981 in words is "one hundred forty-two million, five hundred sixty-nine thousand, nine hundred eighty-one".