145321231 has 8 divisors (see below), whose sum is σ = 158704128. Its totient is φ = 131967000.

The previous prime is 145321223. The next prime is 145321271. The reversal of 145321231 is 132123541.

It is a happy number.

145321231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145321231 - 2³ = 145321223 is a prime.

It is a super-2 number, since 2×145321231² = 42236520358710722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145321271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4236 + ... + 17566.

It is an arithmetic number, because the mean of its divisors is an integer number (19838016).

Almost surely, 2^145321231 is an apocalyptic number.

145321231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

145321231 is a deficient number, since it is larger than the sum of its proper divisors (13382897).

145321231 is a wasteful number, since it uses less digits than its factorization.

145321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14333.

The product of its digits is 720, while the sum is 22.

The square root of 145321231 is about 12054.9255908114. The cubic root of 145321231 is about 525.7464586464.

Adding to 145321231 its reverse (132123541), we get a palindrome (277444772).

The spelling of 145321231 in words is "one hundred forty-five million, three hundred twenty-one thousand, two hundred thirty-one".