1223513251 has 8 divisors (see below), whose sum is σ = 1246641408. Its totient is φ = 1200549000.

The previous prime is 1223513243. The next prime is 1223513257. The reversal of 1223513251 is 1523153221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1223513251 - 2³ = 1223513243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223513257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25855 + ... + 55816.

It is an arithmetic number, because the mean of its divisors is an integer number (155830176).

Almost surely, 2^1223513251 is an apocalyptic number.

1223513251 is a deficient number, since it is larger than the sum of its proper divisors (23128157).

1223513251 is an equidigital number, since it uses as much as digits as its factorization.

1223513251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81953.

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

The square root of 1223513251 is about 34978.7542802770. The cubic root of 1223513251 is about 1069.5544338107.

Adding to 1223513251 its reverse (1523153221), we get a palindrome (2746666472).

The spelling of 1223513251 in words is "one billion, two hundred twenty-three million, five hundred thirteen thousand, two hundred fifty-one".