142557561 has 24 divisors (see below), whose sum is σ = 214705920. Its totient is φ = 91044000.

The previous prime is 142557553. The next prime is 142557577. The reversal of 142557561 is 165755241.

142557561 is a `hidden beast` number, since 1 + 4 + 25 + 575 + 61 = 666.

It is not a de Polignac number, because 142557561 - 2³ = 142557553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142557521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25650 + ... + 30708.

It is an arithmetic number, because the mean of its divisors is an integer number (8946080).

Almost surely, 2^142557561 is an apocalyptic number.

It is an amenable number.

142557561 is a deficient number, since it is larger than the sum of its proper divisors (72148359).

142557561 is a wasteful number, since it uses less digits than its factorization.

142557561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5197 (or 5194 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 142557561 is about 11939.7471078746. The cubic root of 142557561 is about 522.3922823054.

It can be divided in two parts, 1425575 and 61, that added together give a square (1425636 = 1194²).

The spelling of 142557561 in words is "one hundred forty-two million, five hundred fifty-seven thousand, five hundred sixty-one".