1223251531 has 2 divisors, whose sum is σ = 1223251532. Its totient is φ = 1223251530.

The previous prime is 1223251529. The next prime is 1223251553. The reversal of 1223251531 is 1351523221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1223251531 - 2¹ = 1223251529 is a prime.

It is a super-2 number, since 2×1223251531² = 2992688616187687922, which contains 22 as substring.

Together with 1223251529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1223251496 and 1223251505.

It is not a weakly prime, because it can be changed into another prime (1223251571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611625765 + 611625766.

It is an arithmetic number, because the mean of its divisors is an integer number (611625766).

Almost surely, 2^1223251531 is an apocalyptic number.

1223251531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223251531 is an equidigital number, since it uses as much as digits as its factorization.

1223251531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 1223251531 is about 34975.0129521063. The cubic root of 1223251531 is about 1069.4781660771.

Adding to 1223251531 its reverse (1351523221), we get a palindrome (2574774752).

The spelling of 1223251531 in words is "one billion, two hundred twenty-three million, two hundred fifty-one thousand, five hundred thirty-one".