1556120054 has 4 divisors (see below), whose sum is σ = 2334180084. Its totient is φ = 778060026.

The previous prime is 1556120053. The next prime is 1556120089. The reversal of 1556120054 is 4500216551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4500216551 = 1093 ⋅4117307.

It is a junction number, because it is equal to n+sod(n) for n = 1556119999 and 1556120026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556120053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389030012 + ... + 389030015.

It is an arithmetic number, because the mean of its divisors is an integer number (583545021).

Almost surely, 2^1556120054 is an apocalyptic number.

1556120054 is a deficient number, since it is larger than the sum of its proper divisors (778060030).

1556120054 is an equidigital number, since it uses as much as digits as its factorization.

1556120054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778060029.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 1556120054 is about 39447.6875621373. The cubic root of 1556120054 is about 1158.8156893187.

The spelling of 1556120054 in words is "one billion, five hundred fifty-six million, one hundred twenty thousand, fifty-four".