133231493 has 2 divisors, whose sum is σ = 133231494. Its totient is φ = 133231492.

The previous prime is 133231471. The next prime is 133231523. The reversal of 133231493 is 394132331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72982849 + 60248644 = 8543^2 + 7762^2 .

It is a cyclic number.

It is not a de Polignac number, because 133231493 - 2¹² = 133227397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133231403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66615746 + 66615747.

It is an arithmetic number, because the mean of its divisors is an integer number (66615747).

Almost surely, 2^133231493 is an apocalyptic number.

It is an amenable number.

133231493 is a deficient number, since it is larger than the sum of its proper divisors (1).

133231493 is an equidigital number, since it uses as much as digits as its factorization.

133231493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 29.

The square root of 133231493 is about 11542.5947256239. The cubic root of 133231493 is about 510.7428531193.

The spelling of 133231493 in words is "one hundred thirty-three million, two hundred thirty-one thousand, four hundred ninety-three".