133431405 has 8 divisors (see below), whose sum is σ = 213490272. Its totient is φ = 71163408.

The previous prime is 133431377. The next prime is 133431413. The reversal of 133431405 is 504134331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133431405 - 2⁵ = 133431373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4447699 + ... + 4447728.

It is an arithmetic number, because the mean of its divisors is an integer number (26686284).

Almost surely, 2^133431405 is an apocalyptic number.

133431405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133431405 is a deficient number, since it is larger than the sum of its proper divisors (80058867).

133431405 is an equidigital number, since it uses as much as digits as its factorization.

133431405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8895435.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 133431405 is about 11551.2512309273. The cubic root of 133431405 is about 510.9981796369.

Adding to 133431405 its reverse (504134331), we get a palindrome (637565736).

The spelling of 133431405 in words is "one hundred thirty-three million, four hundred thirty-one thousand, four hundred five".