145405231 has 16 divisors (see below), whose sum is σ = 152748288. Its totient is φ = 138297600.

The previous prime is 145405223. The next prime is 145405243. The reversal of 145405231 is 132504541.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 145405231 - 2³ = 145405223 is a prime.

It is a super-2 number, since 2×145405231² = 42285362404326722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145405196 and 145405205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145400231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295896 + ... + 296386.

It is an arithmetic number, because the mean of its divisors is an integer number (9546768).

Almost surely, 2^145405231 is an apocalyptic number.

145405231 is a deficient number, since it is larger than the sum of its proper divisors (7343057).

145405231 is an equidigital number, since it uses as much as digits as its factorization.

145405231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 145405231 is about 12058.4091405127. The cubic root of 145405231 is about 525.8477381723.

Adding to 145405231 its reverse (132504541), we get a palindrome (277909772).

The spelling of 145405231 in words is "one hundred forty-five million, four hundred five thousand, two hundred thirty-one".