1255553815 has 4 divisors (see below), whose sum is σ = 1506664584. Its totient is φ = 1004443048.

The previous prime is 1255553813. The next prime is 1255553821. The reversal of 1255553815 is 5183555521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5183555521 = 9007 ⋅575503.

It is a cyclic number.

It is not a de Polignac number, because 1255553815 - 2¹ = 1255553813 is a prime.

It is a super-2 number, since 2×1255553815² = 3152830764722108450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255553813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125555377 + ... + 125555386.

It is an arithmetic number, because the mean of its divisors is an integer number (376666146).

Almost surely, 2^1255553815 is an apocalyptic number.

1255553815 is a deficient number, since it is larger than the sum of its proper divisors (251110769).

1255553815 is an equidigital number, since it uses as much as digits as its factorization.

1255553815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251110768.

The product of its digits is 150000, while the sum is 40.

The square root of 1255553815 is about 35433.7948151196. The cubic root of 1255553815 is about 1078.8103656088.

The spelling of 1255553815 in words is "one billion, two hundred fifty-five million, five hundred fifty-three thousand, eight hundred fifteen".