142645621 has 4 divisors (see below), whose sum is σ = 142899552. Its totient is φ = 142391692.

The previous prime is 142645579. The next prime is 142645667. The reversal of 142645621 is 126546241.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 126546241 = 1609 ⋅78649.

It is a cyclic number.

It is not a de Polignac number, because 142645621 - 2⁷ = 142645493 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 (142645021) 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, 126121 + ... + 127246.

It is an arithmetic number, because the mean of its divisors is an integer number (35724888).

Almost surely, 2^142645621 is an apocalyptic number.

It is an amenable number.

142645621 is a deficient number, since it is larger than the sum of its proper divisors (253931).

142645621 is an equidigital number, since it uses as much as digits as its factorization.

142645621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253930.

The product of its digits is 11520, while the sum is 31.

The square root of 142645621 is about 11943.4342213620. The cubic root of 142645621 is about 522.4998234167.

The spelling of 142645621 in words is "one hundred forty-two million, six hundred forty-five thousand, six hundred twenty-one".