131004437 has 4 divisors (see below), whose sum is σ = 132036096. Its totient is φ = 129972780.

The previous prime is 131004427. The next prime is 131004439. The reversal of 131004437 is 734400131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 734400131 = 4397 ⋅167023.

It is a cyclic number.

It is not a de Polignac number, because 131004437 - 2⁴ = 131004421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131004439) 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, 515639 + ... + 515892.

It is an arithmetic number, because the mean of its divisors is an integer number (33009024).

Almost surely, 2^131004437 is an apocalyptic number.

It is an amenable number.

131004437 is a deficient number, since it is larger than the sum of its proper divisors (1031659).

131004437 is a wasteful number, since it uses less digits than its factorization.

131004437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031658.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 131004437 is about 11445.7169718633. The cubic root of 131004437 is about 507.8810416995.

Adding to 131004437 its reverse (734400131), we get a palindrome (865404568).

The spelling of 131004437 in words is "one hundred thirty-one million, four thousand, four hundred thirty-seven".