1580255981 has 2 divisors, whose sum is σ = 1580255982. Its totient is φ = 1580255980.

The previous prime is 1580255959. The next prime is 1580255993. The reversal of 1580255981 is 1895520851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1533114025 + 47141956 = 39155^2 + 6866^2 .

It is a cyclic number.

It is not a de Polignac number, because 1580255981 - 2¹⁰ = 1580254957 is a prime.

It is a super-2 number, since 2×1580255981² = 4994417930972544722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1580255951) 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 as a sum of consecutive naturals, namely, 790127990 + 790127991.

It is an arithmetic number, because the mean of its divisors is an integer number (790127991).

Almost surely, 2^1580255981 is an apocalyptic number.

It is an amenable number.

1580255981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1580255981 is an equidigital number, since it uses as much as digits as its factorization.

1580255981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 44.

The square root of 1580255981 is about 39752.4336487717. The cubic root of 1580255981 is about 1164.7761807927.

The spelling of 1580255981 in words is "one billion, five hundred eighty million, two hundred fifty-five thousand, nine hundred eighty-one".