133242251 has 8 divisors (see below), whose sum is σ = 139668144. Its totient is φ = 126967680.

The previous prime is 133242233. The next prime is 133242257. The reversal of 133242251 is 152242331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133242251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133242257) 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, 36026 + ... + 39551.

It is an arithmetic number, because the mean of its divisors is an integer number (17458518).

Almost surely, 2^133242251 is an apocalyptic number.

133242251 is a deficient number, since it is larger than the sum of its proper divisors (6425893).

133242251 is an equidigital number, since it uses as much as digits as its factorization.

133242251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75661.

The product of its digits is 1440, while the sum is 23.

The square root of 133242251 is about 11543.0607292867. The cubic root of 133242251 is about 510.7565996783.

Adding to 133242251 its reverse (152242331), we get a palindrome (285484582).

The spelling of 133242251 in words is "one hundred thirty-three million, two hundred forty-two thousand, two hundred fifty-one".