145021231 has 2 divisors, whose sum is σ = 145021232. Its totient is φ = 145021230.

The previous prime is 145021211. The next prime is 145021259. The reversal of 145021231 is 132120541.

145021231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145021231 - 2⁹ = 145020719 is a prime.

It is a super-2 number, since 2×145021231² = 42062314881510722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145021199 and 145021208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145021211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72510615 + 72510616.

It is an arithmetic number, because the mean of its divisors is an integer number (72510616).

Almost surely, 2^145021231 is an apocalyptic number.

145021231 is a deficient number, since it is larger than the sum of its proper divisors (1).

145021231 is an equidigital number, since it uses as much as digits as its factorization.

145021231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 145021231 is about 12042.4761158160. The cubic root of 145021231 is about 525.3844271299.

Adding to 145021231 its reverse (132120541), we get a palindrome (277141772).

The spelling of 145021231 in words is "one hundred forty-five million, twenty-one thousand, two hundred thirty-one".