1604111 has 2 divisors, whose sum is σ = 1604112. Its totient is φ = 1604110.

The previous prime is 1604101. The next prime is 1604123. The reversal of 1604111 is 1114061.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604111 is a prime.

It is equal to p₁₂₁₄₄₂ and since 1604111 and 121442 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802055 + 802056.

It is an arithmetic number, because the mean of its divisors is an integer number (802056).

2^1604111 is an apocalyptic number.

1604111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604111 is an equidigital number, since it uses as much as digits as its factorization.

1604111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1604111 is about 1266.5350370203. The cubic root of 1604111 is about 117.0607958320.

Adding to 1604111 its reverse (1114061), we get a palindrome (2718172).

The spelling of 1604111 in words is "one million, six hundred four thousand, one hundred eleven".