251430133 has 8 divisors (see below), whose sum is σ = 258491808. Its totient is φ = 244382544.

The previous prime is 251430131. The next prime is 251430139. The reversal of 251430133 is 331034152.

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 251430133 - 2¹ = 251430131 is a prime.

It is a super-2 number, since 2×251430133² = 126434223560795378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251430131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40110 + ... + 45952.

It is an arithmetic number, because the mean of its divisors is an integer number (32311476).

Almost surely, 2^251430133 is an apocalyptic number.

It is an amenable number.

251430133 is a deficient number, since it is larger than the sum of its proper divisors (7061675).

251430133 is a wasteful number, since it uses less digits than its factorization.

251430133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 251430133 is about 15856.5485841024. The cubic root of 251430133 is about 631.1594780761.

Adding to 251430133 its reverse (331034152), we get a palindrome (582464285).

The spelling of 251430133 in words is "two hundred fifty-one million, four hundred thirty thousand, one hundred thirty-three".