501530231 has 2 divisors, whose sum is σ = 501530232. Its totient is φ = 501530230.

The previous prime is 501530189. The next prime is 501530233. The reversal of 501530231 is 132035105.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 501530231 - 2¹⁸ = 501268087 is a prime.

It is a super-2 number, since 2×501530231² = 503065145213826722, which contains 22 as substring.

Together with 501530233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501530233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250765115 + 250765116.

It is an arithmetic number, because the mean of its divisors is an integer number (250765116).

Almost surely, 2^501530231 is an apocalyptic number.

501530231 is a deficient number, since it is larger than the sum of its proper divisors (1).

501530231 is an equidigital number, since it uses as much as digits as its factorization.

501530231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 501530231 is about 22394.8706403944. The cubic root of 501530231 is about 794.5093981367.

Adding to 501530231 its reverse (132035105), we get a palindrome (633565336).

The spelling of 501530231 in words is "five hundred one million, five hundred thirty thousand, two hundred thirty-one".