1581072487 has 2 divisors, whose sum is σ = 1581072488. Its totient is φ = 1581072486.

The previous prime is 1581072469. The next prime is 1581072491. The reversal of 1581072487 is 7842701851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1581072487 - 2¹⁹ = 1580548199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1581072497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790536243 + 790536244.

It is an arithmetic number, because the mean of its divisors is an integer number (790536244).

Almost surely, 2^1581072487 is an apocalyptic number.

1581072487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1581072487 is an equidigital number, since it uses as much as digits as its factorization.

1581072487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 1581072487 is about 39762.7022094827. The cubic root of 1581072487 is about 1164.9767565220.

The spelling of 1581072487 in words is "one billion, five hundred eighty-one million, seventy-two thousand, four hundred eighty-seven".