1604044031 has 4 divisors (see below), whose sum is σ = 1604124192. Its totient is φ = 1603963872.

The previous prime is 1604044019. The next prime is 1604044069. The reversal of 1604044031 is 1304404061.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1304404061 = 1429 ⋅912809.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604044031 is a prime.

It is a super-2 number, since 2×1604044031² = 5145914506773457922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1604043988 and 1604044006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604044531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17735 + ... + 59351.

It is an arithmetic number, because the mean of its divisors is an integer number (401031048).

Almost surely, 2^1604044031 is an apocalyptic number.

1604044031 is a deficient number, since it is larger than the sum of its proper divisors (80161).

1604044031 is an equidigital number, since it uses as much as digits as its factorization.

1604044031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80160.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1604044031 is about 40050.5184860321. The cubic root of 1604044031 is about 1170.5916677733.

Adding to 1604044031 its reverse (1304404061), we get a palindrome (2908448092).

The spelling of 1604044031 in words is "one billion, six hundred four million, forty-four thousand, thirty-one".