133400251 has 2 divisors, whose sum is σ = 133400252. Its totient is φ = 133400250.

The previous prime is 133400243. The next prime is 133400279. The reversal of 133400251 is 152004331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133400251 - 2³ = 133400243 is a prime.

It is not a weakly prime, because it can be changed into another prime (133400221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66700125 + 66700126.

It is an arithmetic number, because the mean of its divisors is an integer number (66700126).

Almost surely, 2^133400251 is an apocalyptic number.

133400251 is a deficient number, since it is larger than the sum of its proper divisors (1).

133400251 is an equidigital number, since it uses as much as digits as its factorization.

133400251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 133400251 is about 11549.9026402823. The cubic root of 133400251 is about 510.9584067003.

Adding to 133400251 its reverse (152004331), we get a palindrome (285404582).

The spelling of 133400251 in words is "one hundred thirty-three million, four hundred thousand, two hundred fifty-one".