1581143087 has 2 divisors, whose sum is σ = 1581143088. Its totient is φ = 1581143086.

The previous prime is 1581143071. The next prime is 1581143099. The reversal of 1581143087 is 7803411851.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1581143087 - 2⁴ = 1581143071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1581143087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1581143987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790571543 + 790571544.

It is an arithmetic number, because the mean of its divisors is an integer number (790571544).

Almost surely, 2^1581143087 is an apocalyptic number.

1581143087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1581143087 is an equidigital number, since it uses as much as digits as its factorization.

1581143087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 1581143087 is about 39763.5899661990. The cubic root of 1581143087 is about 1164.9940962572.

The spelling of 1581143087 in words is "one billion, five hundred eighty-one million, one hundred forty-three thousand, eighty-seven".