142644253 has 4 divisors (see below), whose sum is σ = 145335708. Its totient is φ = 139952800.

The previous prime is 142644247. The next prime is 142644259. The reversal of 142644253 is 352446241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 352446241 = 7 ⋅50349463.

It is an interprime number because it is at equal distance from previous prime (142644247) and next prime (142644259).

It can be written as a sum of positive squares in 2 ways, for example, as 37417689 + 105226564 = 6117^2 + 10258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142644253 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142644259) 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, 1345648 + ... + 1345753.

It is an arithmetic number, because the mean of its divisors is an integer number (36333927).

Almost surely, 2^142644253 is an apocalyptic number.

It is an amenable number.

142644253 is a deficient number, since it is larger than the sum of its proper divisors (2691455).

142644253 is an equidigital number, since it uses as much as digits as its factorization.

142644253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691454.

The product of its digits is 23040, while the sum is 31.

The square root of 142644253 is about 11943.3769512647. The cubic root of 142644253 is about 522.4981531188.

The spelling of 142644253 in words is "one hundred forty-two million, six hundred forty-four thousand, two hundred fifty-three".