142538621 has 4 divisors (see below), whose sum is σ = 142623072. Its totient is φ = 142454172.

The previous prime is 142538609. The next prime is 142538623. The reversal of 142538621 is 126835241.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142538621 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 (142538623) 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, 39641 + ... + 43086.

It is an arithmetic number, because the mean of its divisors is an integer number (35655768).

Almost surely, 2^142538621 is an apocalyptic number.

It is an amenable number.

142538621 is a deficient number, since it is larger than the sum of its proper divisors (84451).

142538621 is an equidigital number, since it uses as much as digits as its factorization.

142538621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84450.

The product of its digits is 11520, while the sum is 32.

The square root of 142538621 is about 11938.9539324013. The cubic root of 142538621 is about 522.3691465092.

The spelling of 142538621 in words is "one hundred forty-two million, five hundred thirty-eight thousand, six hundred twenty-one".