1604131 has 2 divisors, whose sum is σ = 1604132. Its totient is φ = 1604130.

The previous prime is 1604129. The next prime is 1604143. The reversal of 1604131 is 1314061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1604131 - 2¹ = 1604129 is a prime.

It is a super-2 number, since 2×1604131² = 5146472530322, which contains 22 as substring.

Together with 1604129, it forms a pair of twin primes.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802065 + 802066.

It is an arithmetic number, because the mean of its divisors is an integer number (802066).

2^1604131 is an apocalyptic number.

1604131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604131 is an equidigital number, since it uses as much as digits as its factorization.

1604131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1604131 is about 1266.5429325530. The cubic root of 1604131 is about 117.0612823333.

Adding to 1604131 its reverse (1314061), we get a palindrome (2918192).

The spelling of 1604131 in words is "one million, six hundred four thousand, one hundred thirty-one".