1225545155 has 4 divisors (see below), whose sum is σ = 1470654192. Its totient is φ = 980436120.

The previous prime is 1225545121. The next prime is 1225545157. The reversal of 1225545155 is 5515455221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5515455221 = 179 ⋅30812599.

It is not a de Polignac number, because 1225545155 - 2¹⁸ = 1225283011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225545157) 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, 122554511 + ... + 122554520.

It is an arithmetic number, because the mean of its divisors is an integer number (367663548).

Almost surely, 2^1225545155 is an apocalyptic number.

1225545155 is a deficient number, since it is larger than the sum of its proper divisors (245109037).

1225545155 is an equidigital number, since it uses as much as digits as its factorization.

1225545155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245109036.

The product of its digits is 50000, while the sum is 35.

The square root of 1225545155 is about 35007.7870623094. The cubic root of 1225545155 is about 1070.1461805698.

The spelling of 1225545155 in words is "one billion, two hundred twenty-five million, five hundred forty-five thousand, one hundred fifty-five".