142881621 has 4 divisors (see below), whose sum is σ = 190508832. Its totient is φ = 95254412.

The previous prime is 142881619. The next prime is 142881623. The reversal of 142881621 is 126188241.

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 an interprime number because it is at equal distance from previous prime (142881619) and next prime (142881623).

It is a cyclic number.

It is not a de Polignac number, because 142881621 - 2¹ = 142881619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142881623) 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 3 ways as a sum of consecutive naturals, for example, 23813601 + ... + 23813606.

It is an arithmetic number, because the mean of its divisors is an integer number (47627208).

Almost surely, 2^142881621 is an apocalyptic number.

It is an amenable number.

142881621 is a deficient number, since it is larger than the sum of its proper divisors (47627211).

142881621 is an equidigital number, since it uses as much as digits as its factorization.

142881621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47627210.

The product of its digits is 6144, while the sum is 33.

The square root of 142881621 is about 11953.3100436657. The cubic root of 142881621 is about 522.7878145388.

The spelling of 142881621 in words is "one hundred forty-two million, eight hundred eighty-one thousand, six hundred twenty-one".