145643231 has 2 divisors, whose sum is σ = 145643232. Its totient is φ = 145643230.

The previous prime is 145643213. The next prime is 145643237. The reversal of 145643231 is 132346541.

Together with previous prime (145643213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145643231 - 2⁶ = 145643167 is a prime.

It is a super-2 number, since 2×145643231² = 42423901472238722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145643194 and 145643203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145643237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72821615 + 72821616.

It is an arithmetic number, because the mean of its divisors is an integer number (72821616).

Almost surely, 2^145643231 is an apocalyptic number.

145643231 is a deficient number, since it is larger than the sum of its proper divisors (1).

145643231 is an equidigital number, since it uses as much as digits as its factorization.

145643231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 145643231 is about 12068.2737373661. The cubic root of 145643231 is about 526.1344851709.

Adding to 145643231 its reverse (132346541), we get a palindrome (277989772).

The spelling of 145643231 in words is "one hundred forty-five million, six hundred forty-three thousand, two hundred thirty-one".