1225551011 has 4 divisors (see below), whose sum is σ = 1225637712. Its totient is φ = 1225464312.

The previous prime is 1225550971. The next prime is 1225551013. The reversal of 1225551011 is 1101555221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1225551011 - 2¹⁴ = 1225534627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225551013) 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, 16676 + ... + 52241.

It is an arithmetic number, because the mean of its divisors is an integer number (306409428).

Almost surely, 2^1225551011 is an apocalyptic number.

1225551011 is a deficient number, since it is larger than the sum of its proper divisors (86701).

1225551011 is an equidigital number, since it uses as much as digits as its factorization.

1225551011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86700.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 1225551011 is about 35007.8707007439. The cubic root of 1225551011 is about 1070.1478850537.

The spelling of 1225551011 in words is "one billion, two hundred twenty-five million, five hundred fifty-one thousand, eleven".