133281251 has 8 divisors (see below), whose sum is σ = 139636224. Its totient is φ = 126973000.

The previous prime is 133281221. The next prime is 133281259. The reversal of 133281251 is 152182331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133281251 - 2¹⁴ = 133264867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133281251.

It is not an unprimeable number, because it can be changed into a prime (133281259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5771 + ... + 17316.

It is an arithmetic number, because the mean of its divisors is an integer number (17454528).

Almost surely, 2^133281251 is an apocalyptic number.

133281251 is a deficient number, since it is larger than the sum of its proper divisors (6354973).

133281251 is a wasteful number, since it uses less digits than its factorization.

133281251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23361.

The product of its digits is 1440, while the sum is 26.

The square root of 133281251 is about 11544.7499323285. The cubic root of 133281251 is about 510.8064276272.

The spelling of 133281251 in words is "one hundred thirty-three million, two hundred eighty-one thousand, two hundred fifty-one".