133305457 has 2 divisors, whose sum is σ = 133305458. Its totient is φ = 133305456.

The previous prime is 133305443. The next prime is 133305467. The reversal of 133305457 is 754503331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127035441 + 6270016 = 11271^2 + 2504^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133305457 is a prime.

It is not a weakly prime, because it can be changed into another prime (133305407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66652728 + 66652729.

It is an arithmetic number, because the mean of its divisors is an integer number (66652729).

Almost surely, 2^133305457 is an apocalyptic number.

It is an amenable number.

133305457 is a deficient number, since it is larger than the sum of its proper divisors (1).

133305457 is an equidigital number, since it uses as much as digits as its factorization.

133305457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 31.

The square root of 133305457 is about 11545.7982400525. The cubic root of 133305457 is about 510.8373492856.

Adding to 133305457 its reverse (754503331), we get a palindrome (887808788).

The spelling of 133305457 in words is "one hundred thirty-three million, three hundred five thousand, four hundred fifty-seven".