133121431 has 2 divisors, whose sum is σ = 133121432. Its totient is φ = 133121430.

The previous prime is 133121389. The next prime is 133121453. The reversal of 133121431 is 134121331.

It is a strong prime.

It is an emirp because it is prime and its reverse (134121331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133121431 - 2¹⁷ = 132990359 is a prime.

It is a super-2 number, since 2×133121431² = 35442630782975522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133121399 and 133121408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133121731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66560715 + 66560716.

It is an arithmetic number, because the mean of its divisors is an integer number (66560716).

Almost surely, 2^133121431 is an apocalyptic number.

133121431 is a deficient number, since it is larger than the sum of its proper divisors (1).

133121431 is an equidigital number, since it uses as much as digits as its factorization.

133121431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 133121431 is about 11537.8260950666. The cubic root of 133121431 is about 510.6021735023.

Adding to 133121431 its reverse (134121331), we get a palindrome (267242762).

The spelling of 133121431 in words is "one hundred thirty-three million, one hundred twenty-one thousand, four hundred thirty-one".