1222551 has 24 divisors (see below), whose sum is σ = 1971216. Its totient is φ = 723840.

The previous prime is 1222537. The next prime is 1222561. The reversal of 1222551 is 1552221.

It is not a de Polignac number, because 1222551 - 2¹⁰ = 1221527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5131 + ... + 5363.

It is an arithmetic number, because the mean of its divisors is an integer number (82134).

2^1222551 is an apocalyptic number.

1222551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1222551 is a deficient number, since it is larger than the sum of its proper divisors (748665).

1222551 is a wasteful number, since it uses less digits than its factorization.

1222551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 300 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 1222551 is about 1105.6902821315. The cubic root of 1222551 is about 106.9273971041.

Adding to 1222551 its reverse (1552221), we get a palindrome (2774772).

The spelling of 1222551 in words is "one million, two hundred twenty-two thousand, five hundred fifty-one".