1223243251 has 4 divisors (see below), whose sum is σ = 1224890352. Its totient is φ = 1221596152.

The previous prime is 1223243239. The next prime is 1223243257. The reversal of 1223243251 is 1523423221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1523423221 = 43 ⋅35428447.

It is a cyclic number.

It is not a de Polignac number, because 1223243251 - 2¹⁷ = 1223112179 is a prime.

It is a super-2 number, since 2×1223243251² = 2992648102234098002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223243257) 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 in 3 ways as a sum of consecutive naturals, for example, 822436 + ... + 823921.

It is an arithmetic number, because the mean of its divisors is an integer number (306222588).

Almost surely, 2^1223243251 is an apocalyptic number.

1223243251 is a deficient number, since it is larger than the sum of its proper divisors (1647101).

1223243251 is an equidigital number, since it uses as much as digits as its factorization.

1223243251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647100.

The product of its digits is 2880, while the sum is 25.

The square root of 1223243251 is about 34974.8945816853. The cubic root of 1223243251 is about 1069.4757530277.

Adding to 1223243251 its reverse (1523423221), we get a palindrome (2746666472).

The spelling of 1223243251 in words is "one billion, two hundred twenty-three million, two hundred forty-three thousand, two hundred fifty-one".