1225628851 has 4 divisors (see below), whose sum is σ = 1226318032. Its totient is φ = 1224939672.

The previous prime is 1225628837. The next prime is 1225628903. The reversal of 1225628851 is 1588265221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1588265221 = 26431 ⋅60091.

It is a cyclic number.

It is not a de Polignac number, because 1225628851 - 2¹³ = 1225620659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225628051) 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, 341916 + ... + 345481.

It is an arithmetic number, because the mean of its divisors is an integer number (306579508).

Almost surely, 2^1225628851 is an apocalyptic number.

1225628851 is a deficient number, since it is larger than the sum of its proper divisors (689181).

1225628851 is an equidigital number, since it uses as much as digits as its factorization.

1225628851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689180.

The product of its digits is 76800, while the sum is 40.

The square root of 1225628851 is about 35008.9824330842. The cubic root of 1225628851 is about 1070.1705411345.

The spelling of 1225628851 in words is "one billion, two hundred twenty-five million, six hundred twenty-eight thousand, eight hundred fifty-one".