231223501 has 2 divisors, whose sum is σ = 231223502. Its totient is φ = 231223500.

The previous prime is 231223481. The next prime is 231223507. The reversal of 231223501 is 105322132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201782025 + 29441476 = 14205^2 + 5426^2 .

It is a cyclic number.

It is not a de Polignac number, because 231223501 - 2⁷ = 231223373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231223507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115611750 + 115611751.

It is an arithmetic number, because the mean of its divisors is an integer number (115611751).

Almost surely, 2^231223501 is an apocalyptic number.

It is an amenable number.

231223501 is a deficient number, since it is larger than the sum of its proper divisors (1).

231223501 is an equidigital number, since it uses as much as digits as its factorization.

231223501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 231223501 is about 15206.0350190311. The cubic root of 231223501 is about 613.7770670116. Note that the first 3 decimals are identical.

Adding to 231223501 its reverse (105322132), we get a palindrome (336545633).

The spelling of 231223501 in words is "two hundred thirty-one million, two hundred twenty-three thousand, five hundred one".