1555428851 has 4 divisors (see below), whose sum is σ = 1557740712. Its totient is φ = 1553116992.

The previous prime is 1555428839. The next prime is 1555428989. The reversal of 1555428851 is 1588245551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1588245551 = 33179 ⋅47869.

It is a cyclic number.

It is not a de Polignac number, because 1555428851 - 2¹⁰ = 1555427827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555428451) 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, 1154921 + ... + 1156266.

It is an arithmetic number, because the mean of its divisors is an integer number (389435178).

Almost surely, 2^1555428851 is an apocalyptic number.

1555428851 is a deficient number, since it is larger than the sum of its proper divisors (2311861).

1555428851 is an equidigital number, since it uses as much as digits as its factorization.

1555428851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311860.

The product of its digits is 320000, while the sum is 44.

The square root of 1555428851 is about 39438.9255812072. The cubic root of 1555428851 is about 1158.6440882691.

The spelling of 1555428851 in words is "one billion, five hundred fifty-five million, four hundred twenty-eight thousand, eight hundred fifty-one".