251211053 has 4 divisors (see below), whose sum is σ = 251253660. Its totient is φ = 251168448.

The previous prime is 251211049. The next prime is 251211089. The reversal of 251211053 is 350112152.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 149866564 + 101344489 = 12242^2 + 10067^2 .

It is a cyclic number.

It is not a de Polignac number, because 251211053 - 2² = 251211049 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251211353) 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 3 ways as a sum of consecutive naturals, for example, 10700 + ... + 24837.

It is an arithmetic number, because the mean of its divisors is an integer number (62813415).

Almost surely, 2^251211053 is an apocalyptic number.

It is an amenable number.

251211053 is a deficient number, since it is larger than the sum of its proper divisors (42607).

251211053 is an equidigital number, since it uses as much as digits as its factorization.

251211053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42606.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 251211053 is about 15849.6388917855. The cubic root of 251211053 is about 630.9761075875.

The spelling of 251211053 in words is "two hundred fifty-one million, two hundred eleven thousand, fifty-three".