145513231 has 2 divisors, whose sum is σ = 145513232. Its totient is φ = 145513230.

The previous prime is 145513211. The next prime is 145513301. The reversal of 145513231 is 132315541.

It is a happy number.

145513231 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 145513231 - 2⁷ = 145513103 is a prime.

It is a super-3 number, since 3×145513231³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 145513196 and 145513205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145513211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72756615 + 72756616.

It is an arithmetic number, because the mean of its divisors is an integer number (72756616).

Almost surely, 2^145513231 is an apocalyptic number.

145513231 is a deficient number, since it is larger than the sum of its proper divisors (1).

145513231 is an equidigital number, since it uses as much as digits as its factorization.

145513231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 145513231 is about 12062.8865119423. The cubic root of 145513231 is about 525.9778974072.

Adding to 145513231 its reverse (132315541), we get a palindrome (277828772).

The spelling of 145513231 in words is "one hundred forty-five million, five hundred thirteen thousand, two hundred thirty-one".