1604540887 has 2 divisors, whose sum is σ = 1604540888. Its totient is φ = 1604540886.

The previous prime is 1604540879. The next prime is 1604540897. The reversal of 1604540887 is 7880454061.

It is a weak prime.

It is an emirp because it is prime and its reverse (7880454061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1604540887 - 2³ = 1604540879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604540897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802270443 + 802270444.

It is an arithmetic number, because the mean of its divisors is an integer number (802270444).

Almost surely, 2^1604540887 is an apocalyptic number.

1604540887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604540887 is an equidigital number, since it uses as much as digits as its factorization.

1604540887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 1604540887 is about 40056.7208717838. The cubic root of 1604540887 is about 1170.7125197035.

The spelling of 1604540887 in words is "one billion, six hundred four million, five hundred forty thousand, eight hundred eighty-seven".