133405131 has 4 divisors (see below), whose sum is σ = 177873512. Its totient is φ = 88936752.

The previous prime is 133405123. The next prime is 133405141. The reversal of 133405131 is 131504331.

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

It is not a de Polignac number, because 133405131 - 2³ = 133405123 is a prime.

It is a super-2 number, since 2×133405131² = 35593857954254322, 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 = 133405098 and 133405107.

It is not an unprimeable number, because it can be changed into a prime (133405141) 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, 22234186 + ... + 22234191.

It is an arithmetic number, because the mean of its divisors is an integer number (44468378).

Almost surely, 2^133405131 is an apocalyptic number.

133405131 is a deficient number, since it is larger than the sum of its proper divisors (44468381).

133405131 is an equidigital number, since it uses as much as digits as its factorization.

133405131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44468380.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 133405131 is about 11550.1138955423. The cubic root of 133405131 is about 510.9646371899.

Adding to 133405131 its reverse (131504331), we get a palindrome (264909462).

The spelling of 133405131 in words is "one hundred thirty-three million, four hundred five thousand, one hundred thirty-one".