523140321 has 8 divisors (see below), whose sum is σ = 760931424. Its totient is φ = 317054720.

The previous prime is 523140301. The next prime is 523140347. The reversal of 523140321 is 123041325.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523140321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (523140301) 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, 7926336 + ... + 7926401.

It is an arithmetic number, because the mean of its divisors is an integer number (95116428).

Almost surely, 2^523140321 is an apocalyptic number.

It is an amenable number.

523140321 is a deficient number, since it is larger than the sum of its proper divisors (237791103).

523140321 is a wasteful number, since it uses less digits than its factorization.

523140321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15852751.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 523140321 is about 22872.2609507674. The cubic root of 523140321 is about 805.7606693146.

Adding to 523140321 its reverse (123041325), we get a palindrome (646181646).

The spelling of 523140321 in words is "five hundred twenty-three million, one hundred forty thousand, three hundred twenty-one".