133420431 has 16 divisors (see below), whose sum is σ = 180880128. Its totient is φ = 87460800.

The previous prime is 133420423. The next prime is 133420433. The reversal of 133420431 is 134024331.

It is not a de Polignac number, because 133420431 - 2³ = 133420423 is a prime.

It is a super-2 number, since 2×133420431² = 35602022816451522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133420398 and 133420407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133420433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121075 + ... + 122171.

It is an arithmetic number, because the mean of its divisors is an integer number (11305008).

Almost surely, 2^133420431 is an apocalyptic number.

133420431 is a deficient number, since it is larger than the sum of its proper divisors (47459697).

133420431 is a wasteful number, since it uses less digits than its factorization.

133420431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 133420431 is about 11550.7762076841. The cubic root of 133420431 is about 510.9841703219.

Adding to 133420431 its reverse (134024331), we get a palindrome (267444762).

The spelling of 133420431 in words is "one hundred thirty-three million, four hundred twenty thousand, four hundred thirty-one".