1001225231 has 2 divisors, whose sum is σ = 1001225232. Its totient is φ = 1001225230.

The previous prime is 1001225227. The next prime is 1001225297. The reversal of 1001225231 is 1325221001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001225231 - 2² = 1001225227 is a prime.

It is a super-2 number, since 2×1001225231² = 2004903926382006722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001225531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500612615 + 500612616.

It is an arithmetic number, because the mean of its divisors is an integer number (500612616).

Almost surely, 2^1001225231 is an apocalyptic number.

1001225231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001225231 is an equidigital number, since it uses as much as digits as its factorization.

1001225231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1001225231 is about 31642.1432744370. The cubic root of 1001225231 is about 1000.4082436478.

Adding to 1001225231 its reverse (1325221001), we get a palindrome (2326446232).

The spelling of 1001225231 in words is "one billion, one million, two hundred twenty-five thousand, two hundred thirty-one".