1641587 has 2 divisors, whose sum is σ = 1641588. Its totient is φ = 1641586.

The previous prime is 1641583. The next prime is 1641589. The reversal of 1641587 is 7851461.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7851461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1641587 - 2² = 1641583 is a prime.

Together with 1641589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1641583) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820793 + 820794.

It is an arithmetic number, because the mean of its divisors is an integer number (820794).

2^1641587 is an apocalyptic number.

1641587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641587 is an equidigital number, since it uses as much as digits as its factorization.

1641587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 1641587 is about 1281.2443170606. The cubic root of 1641587 is about 117.9653973040.

The spelling of 1641587 in words is "one million, six hundred forty-one thousand, five hundred eighty-seven".