131004 has 24 divisors (see below), whose sum is σ = 339920. Its totient is φ = 43632.

The previous prime is 130987. The next prime is 131009. The reversal of 131004 is 400131.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131009) by changing a digit.

131004 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499 + ... + 714.

2¹³¹⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

131004 is an abundant number, since it is smaller than the sum of its proper divisors (208916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131004 is a wasteful number, since it uses less digits than its factorization.

131004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 131004 is about 361.9447471645. The cubic root of 131004 is about 50.7880476975.

Adding to 131004 its reverse (400131), we get a palindrome (531135).

The spelling of 131004 in words is "one hundred thirty-one thousand, four".