1222401251 has 4 divisors (see below), whose sum is σ = 1222655472. Its totient is φ = 1222147032.

The previous prime is 1222401223. The next prime is 1222401253. The reversal of 1222401251 is 1521042221.

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 1222401251 - 2²⁶ = 1155292387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222401253) 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, 119756 + ... + 129561.

It is an arithmetic number, because the mean of its divisors is an integer number (305663868).

Almost surely, 2^1222401251 is an apocalyptic number.

1222401251 is a deficient number, since it is larger than the sum of its proper divisors (254221).

1222401251 is an equidigital number, since it uses as much as digits as its factorization.

1222401251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254220.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1222401251 is about 34962.8553038793. The cubic root of 1222401251 is about 1069.2303111727.

Adding to 1222401251 its reverse (1521042221), we get a palindrome (2743443472).

The spelling of 1222401251 in words is "one billion, two hundred twenty-two million, four hundred one thousand, two hundred fifty-one".