145421143 has 4 divisors (see below), whose sum is σ = 166195600. Its totient is φ = 124646688.

The previous prime is 145421123. The next prime is 145421147. The reversal of 145421143 is 341124541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341124541 = 71 ⋅4804571.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145421143 is a prime.

It is a super-2 number, since 2×145421143² = 42294617662852898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145421147) 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, 10387218 + ... + 10387231.

It is an arithmetic number, because the mean of its divisors is an integer number (41548900).

Almost surely, 2^145421143 is an apocalyptic number.

145421143 is a deficient number, since it is larger than the sum of its proper divisors (20774457).

145421143 is an equidigital number, since it uses as much as digits as its factorization.

145421143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20774456.

The product of its digits is 1920, while the sum is 25.

The square root of 145421143 is about 12059.0689109898. The cubic root of 145421143 is about 525.8669190137.

Adding to 145421143 its reverse (341124541), we get a palindrome (486545684).

The spelling of 145421143 in words is "one hundred forty-five million, four hundred twenty-one thousand, one hundred forty-three".