1580087981 has 2 divisors, whose sum is σ = 1580087982. Its totient is φ = 1580087980.

The previous prime is 1580087963. The next prime is 1580087983. The reversal of 1580087981 is 1897800851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 907515625 + 672572356 = 30125^2 + 25934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1580087981 is a prime.

It is a super-2 number, since 2×1580087981² = 4993356055401312722, which contains 22 as substring.

Together with 1580087983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1580087983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790043990 + 790043991.

It is an arithmetic number, because the mean of its divisors is an integer number (790043991).

Almost surely, 2^1580087981 is an apocalyptic number.

It is an amenable number.

1580087981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1580087981 is an equidigital number, since it uses as much as digits as its factorization.

1580087981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 47.

The square root of 1580087981 is about 39750.3205144311. The cubic root of 1580087981 is about 1164.7349028108.

The spelling of 1580087981 in words is "one billion, five hundred eighty million, eighty-seven thousand, nine hundred eighty-one".