145652321 has 4 divisors (see below), whose sum is σ = 148400532. Its totient is φ = 142904112.

The previous prime is 145652317. The next prime is 145652341. The reversal of 145652321 is 123256541.

145652321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108576400 + 37075921 = 10420^2 + 6089^2 .

It is not a de Polignac number, because 145652321 - 2² = 145652317 is a prime.

It is a super-2 number, since 2×145652321² = 42429197225374082, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145652341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1374026 + ... + 1374131.

It is an arithmetic number, because the mean of its divisors is an integer number (37100133).

Almost surely, 2^145652321 is an apocalyptic number.

It is an amenable number.

145652321 is a deficient number, since it is larger than the sum of its proper divisors (2748211).

145652321 is an equidigital number, since it uses as much as digits as its factorization.

145652321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748210.

The product of its digits is 7200, while the sum is 29.

The square root of 145652321 is about 12068.6503387910. The cubic root of 145652321 is about 526.1454307831.

The spelling of 145652321 in words is "one hundred forty-five million, six hundred fifty-two thousand, three hundred twenty-one".