145231121 has 4 divisors (see below), whose sum is σ = 165978432. Its totient is φ = 124483812.

The previous prime is 145231111. The next prime is 145231147. The reversal of 145231121 is 121132541.

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: 121132541 = 1327 ⋅91283.

It is a cyclic number.

It is not a de Polignac number, because 145231121 - 2²⁶ = 78122257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 145231093 and 145231102.

It is not an unprimeable number, because it can be changed into a prime (145231111) 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, 10373645 + ... + 10373658.

It is an arithmetic number, because the mean of its divisors is an integer number (41494608).

Almost surely, 2^145231121 is an apocalyptic number.

It is an amenable number.

145231121 is a deficient number, since it is larger than the sum of its proper divisors (20747311).

145231121 is an equidigital number, since it uses as much as digits as its factorization.

145231121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20747310.

The product of its digits is 240, while the sum is 20.

The square root of 145231121 is about 12051.1875348449. The cubic root of 145231121 is about 525.6377688414.

Adding to 145231121 its reverse (121132541), we get a palindrome (266363662).

The spelling of 145231121 in words is "one hundred forty-five million, two hundred thirty-one thousand, one hundred twenty-one".