1331587 has 2 divisors, whose sum is σ = 1331588. Its totient is φ = 1331586.

The previous prime is 1331579. The next prime is 1331591. The reversal of 1331587 is 7851331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331587 - 2³ = 1331579 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665793 + 665794.

It is an arithmetic number, because the mean of its divisors is an integer number (665794).

2^1331587 is an apocalyptic number.

1331587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331587 is an equidigital number, since it uses as much as digits as its factorization.

1331587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 1331587 is about 1153.9441060987. The cubic root of 1331587 is about 110.0161684223.

The spelling of 1331587 in words is "one million, three hundred thirty-one thousand, five hundred eighty-seven".