1225242257 has 8 divisors (see below), whose sum is σ = 1269825600. Its totient is φ = 1180814544.

The previous prime is 1225242253. The next prime is 1225242259. The reversal of 1225242257 is 7522425221.

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 1225242257 - 2² = 1225242253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225242251) 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, 22757 + ... + 54482.

It is an arithmetic number, because the mean of its divisors is an integer number (158728200).

Almost surely, 2^1225242257 is an apocalyptic number.

It is an amenable number.

1225242257 is a deficient number, since it is larger than the sum of its proper divisors (44583343).

1225242257 is an equidigital number, since it uses as much as digits as its factorization.

1225242257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77815.

The product of its digits is 22400, while the sum is 32.

The square root of 1225242257 is about 35003.4606431993. The cubic root of 1225242257 is about 1070.0580097819.

Adding to 1225242257 its reverse (7522425221), we get a palindrome (8747667478).

The spelling of 1225242257 in words is "one billion, two hundred twenty-five million, two hundred forty-two thousand, two hundred fifty-seven".