1222355251 has 4 divisors (see below), whose sum is σ = 1316382592. Its totient is φ = 1128327912.

The previous prime is 1222355243. The next prime is 1222355257. The reversal of 1222355251 is 1525532221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222355251 - 2³ = 1222355243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222355257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47013651 + ... + 47013676.

It is an arithmetic number, because the mean of its divisors is an integer number (329095648).

Almost surely, 2^1222355251 is an apocalyptic number.

1222355251 is a deficient number, since it is larger than the sum of its proper divisors (94027341).

1222355251 is an equidigital number, since it uses as much as digits as its factorization.

1222355251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94027340.

The product of its digits is 6000, while the sum is 28.

The square root of 1222355251 is about 34962.1974566817. The cubic root of 1222355251 is about 1069.2168989888.

Adding to 1222355251 its reverse (1525532221), we get a palindrome (2747887472).

The spelling of 1222355251 in words is "one billion, two hundred twenty-two million, three hundred fifty-five thousand, two hundred fifty-one".