145520231 has 8 divisors (see below), whose sum is σ = 155395200. Its totient is φ = 135969120.

The previous prime is 145520227. The next prime is 145520239. The reversal of 145520231 is 132025541.

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

It is a cyclic number.

It is not a de Polignac number, because 145520231 - 2² = 145520227 is a prime.

It is a super-2 number, since 2×145520231² = 42352275260586722, 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 = 145520197 and 145520206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145520239) 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, 80036 + ... + 81833.

It is an arithmetic number, because the mean of its divisors is an integer number (19424400).

Almost surely, 2^145520231 is an apocalyptic number.

145520231 is a deficient number, since it is larger than the sum of its proper divisors (9874969).

145520231 is a wasteful number, since it uses less digits than its factorization.

145520231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161929.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 145520231 is about 12063.1766545964. The cubic root of 145520231 is about 525.9863314312.

Adding to 145520231 its reverse (132025541), we get a palindrome (277545772).

The spelling of 145520231 in words is "one hundred forty-five million, five hundred twenty thousand, two hundred thirty-one".