142637521 has 12 divisors (see below), whose sum is σ = 154949760. Its totient is φ = 131242800.

The previous prime is 142637471. The next prime is 142637533. The reversal of 142637521 is 125736241.

It is not a de Polignac number, because 142637521 - 2⁷ = 142637393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142637221) 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 11 ways as a sum of consecutive naturals, for example, 59496 + ... + 61846.

It is an arithmetic number, because the mean of its divisors is an integer number (12912480).

Almost surely, 2^142637521 is an apocalyptic number.

It is an amenable number.

142637521 is a deficient number, since it is larger than the sum of its proper divisors (12312239).

142637521 is a wasteful number, since it uses less digits than its factorization.

142637521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736 (or 2723 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 142637521 is about 11943.0951181007. The cubic root of 142637521 is about 522.4899333393.

The spelling of 142637521 in words is "one hundred forty-two million, six hundred thirty-seven thousand, five hundred twenty-one".