501001231 has 2 divisors, whose sum is σ = 501001232. Its totient is φ = 501001230.

The previous prime is 501001229. The next prime is 501001279. The reversal of 501001231 is 132100105.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 501001231 - 2¹ = 501001229 is a prime.

It is a super-2 number, since 2×501001231² = 502004466927030722, which contains 22 as substring.

Together with 501001229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501001211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250500615 + 250500616.

It is an arithmetic number, because the mean of its divisors is an integer number (250500616).

Almost surely, 2^501001231 is an apocalyptic number.

501001231 is a deficient number, since it is larger than the sum of its proper divisors (1).

501001231 is an equidigital number, since it uses as much as digits as its factorization.

501001231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 501001231 is about 22383.0567840945. The cubic root of 501001231 is about 794.2299577997.

Adding to 501001231 its reverse (132100105), we get a palindrome (633101336).

The spelling of 501001231 in words is "five hundred one million, one thousand, two hundred thirty-one".