133212437 has 4 divisors (see below), whose sum is σ = 133235820. Its totient is φ = 133189056.

The previous prime is 133212419. The next prime is 133212449. The reversal of 133212437 is 734212331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113507716 + 19704721 = 10654^2 + 4439^2 .

It is a cyclic number.

It is not a de Polignac number, because 133212437 - 2⁸ = 133212181 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133212467) 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, 3053 + ... + 16605.

It is an arithmetic number, because the mean of its divisors is an integer number (33308955).

Almost surely, 2^133212437 is an apocalyptic number.

It is an amenable number.

133212437 is a deficient number, since it is larger than the sum of its proper divisors (23383).

133212437 is an equidigital number, since it uses as much as digits as its factorization.

133212437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23382.

The product of its digits is 3024, while the sum is 26.

The square root of 133212437 is about 11541.7692317946. The cubic root of 133212437 is about 510.7185015699.

Adding to 133212437 its reverse (734212331), we get a palindrome (867424768).

The spelling of 133212437 in words is "one hundred thirty-three million, two hundred twelve thousand, four hundred thirty-seven".