1556120141 has 2 divisors, whose sum is σ = 1556120142. Its totient is φ = 1556120140.

The previous prime is 1556120123. The next prime is 1556120161. The reversal of 1556120141 is 1410216551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1555986916 + 133225 = 39446^2 + 365^2 .

It is an emirp because it is prime and its reverse (1410216551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1556120141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1556120141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1556120161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778060070 + 778060071.

It is an arithmetic number, because the mean of its divisors is an integer number (778060071).

Almost surely, 2^1556120141 is an apocalyptic number.

It is an amenable number.

1556120141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556120141 is an equidigital number, since it uses as much as digits as its factorization.

1556120141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1556120141 is about 39447.6886648635. The cubic root of 1556120141 is about 1158.8157109145.

Adding to 1556120141 its reverse (1410216551), we get a palindrome (2966336692).

The spelling of 1556120141 in words is "one billion, five hundred fifty-six million, one hundred twenty thousand, one hundred forty-one".