133125251 has 4 divisors (see below), whose sum is σ = 152143152. Its totient is φ = 114107352.

The previous prime is 133125247. The next prime is 133125259. The reversal of 133125251 is 152521331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133125251 - 2² = 133125247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133125259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9508940 + ... + 9508953.

It is an arithmetic number, because the mean of its divisors is an integer number (38035788).

Almost surely, 2^133125251 is an apocalyptic number.

133125251 is a deficient number, since it is larger than the sum of its proper divisors (19017901).

133125251 is an equidigital number, since it uses as much as digits as its factorization.

133125251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19017900.

The product of its digits is 900, while the sum is 23.

The square root of 133125251 is about 11537.9916363291. The cubic root of 133125251 is about 510.6070574684.

Adding to 133125251 its reverse (152521331), we get a palindrome (285646582).

The spelling of 133125251 in words is "one hundred thirty-three million, one hundred twenty-five thousand, two hundred fifty-one".