145431227 has 4 divisors (see below), whose sum is σ = 146930616. Its totient is φ = 143931840.

The previous prime is 145431211. The next prime is 145431229. The reversal of 145431227 is 722134541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 722134541 = 577 ⋅1251533.

It is a cyclic number.

It is not a de Polignac number, because 145431227 - 2⁴ = 145431211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145431227.

It is not an unprimeable number, because it can be changed into a prime (145431229) 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, 749549 + ... + 749742.

It is an arithmetic number, because the mean of its divisors is an integer number (36732654).

Almost surely, 2^145431227 is an apocalyptic number.

145431227 is a deficient number, since it is larger than the sum of its proper divisors (1499389).

145431227 is an equidigital number, since it uses as much as digits as its factorization.

145431227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499388.

The product of its digits is 6720, while the sum is 29.

The square root of 145431227 is about 12059.4870123069. The cubic root of 145431227 is about 525.8790738704.

Adding to 145431227 its reverse (722134541), we get a palindrome (867565768).

The spelling of 145431227 in words is "one hundred forty-five million, four hundred thirty-one thousand, two hundred twenty-seven".