1131604 has 12 divisors (see below), whose sum is σ = 2000628. Its totient is φ = 560000.

The previous prime is 1131569. The next prime is 1131617. The reversal of 1131604 is 4061311.

It can be written as a sum of positive squares in 2 ways, for example, as 883600 + 248004 = 940^2 + 498^2 .

It is a super-2 number, since 2×1131604² = 2561055225632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997 + ... + 1804.

It is an arithmetic number, because the mean of its divisors is an integer number (166719).

2^1131604 is an apocalyptic number.

It is an amenable number.

1131604 is a deficient number, since it is larger than the sum of its proper divisors (869024).

1131604 is a wasteful number, since it uses less digits than its factorization.

1131604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906 (or 2904 counting only the distinct ones).

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

The square root of 1131604 is about 1063.7687718673. The cubic root of 1131604 is about 104.2073034694.

Adding to 1131604 its reverse (4061311), we get a palindrome (5192915).

The spelling of 1131604 in words is "one million, one hundred thirty-one thousand, six hundred four".