133231437 has 6 divisors (see below), whose sum is σ = 192445422. Its totient is φ = 88820952.

The previous prime is 133231411. The next prime is 133231457. The reversal of 133231437 is 734132331.

It can be written as a sum of positive squares in only one way, i.e., 115541001 + 17690436 = 10749^2 + 4206^2 .

It is not a de Polignac number, because 133231437 - 2¹⁴ = 133215053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133231437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133231457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7401738 + ... + 7401755.

It is an arithmetic number, because the mean of its divisors is an integer number (32074237).

Almost surely, 2^133231437 is an apocalyptic number.

It is an amenable number.

133231437 is a deficient number, since it is larger than the sum of its proper divisors (59213985).

133231437 is a wasteful number, since it uses less digits than its factorization.

133231437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14803499 (or 14803496 counting only the distinct ones).

The product of its digits is 4536, while the sum is 27.

The square root of 133231437 is about 11542.5922998259. The cubic root of 133231437 is about 510.7427815607.

Adding to 133231437 its reverse (734132331), we get a palindrome (867363768).

The spelling of 133231437 in words is "one hundred thirty-three million, two hundred thirty-one thousand, four hundred thirty-seven".