1225022551 has 4 divisors (see below), whose sum is σ = 1236261400. Its totient is φ = 1213783704.

The previous prime is 1225022543. The next prime is 1225022593. The reversal of 1225022551 is 1552205221.

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 1225022551 - 2³ = 1225022543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225022651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5619261 + ... + 5619478.

It is an arithmetic number, because the mean of its divisors is an integer number (309065350).

Almost surely, 2^1225022551 is an apocalyptic number.

1225022551 is a deficient number, since it is larger than the sum of its proper divisors (11238849).

1225022551 is a wasteful number, since it uses less digits than its factorization.

1225022551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11238848.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1225022551 is about 35000.3221556602. The cubic root of 1225022551 is about 1069.9940463174.

Adding to 1225022551 its reverse (1552205221), we get a palindrome (2777227772).

The spelling of 1225022551 in words is "one billion, two hundred twenty-five million, twenty-two thousand, five hundred fifty-one".