133220431 has 4 divisors (see below), whose sum is σ = 133249000. Its totient is φ = 133191864.

The previous prime is 133220413. The next prime is 133220459. The reversal of 133220431 is 134022331.

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

It is a cyclic number.

It is not a de Polignac number, because 133220431 - 2¹⁹ = 132696143 is a prime.

It is a super-2 number, since 2×133220431² = 35495366471651522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133220399 and 133220408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133229431) 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, 5481 + ... + 17218.

It is an arithmetic number, because the mean of its divisors is an integer number (33312250).

Almost surely, 2^133220431 is an apocalyptic number.

133220431 is a deficient number, since it is larger than the sum of its proper divisors (28569).

133220431 is an equidigital number, since it uses as much as digits as its factorization.

133220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28568.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 133220431 is about 11542.1155339912. The cubic root of 133220431 is about 510.7287173378.

Adding to 133220431 its reverse (134022331), we get a palindrome (267242762).

The spelling of 133220431 in words is "one hundred thirty-three million, two hundred twenty thousand, four hundred thirty-one".