513242251 has 2 divisors, whose sum is σ = 513242252. Its totient is φ = 513242250.

The previous prime is 513242243. The next prime is 513242267. The reversal of 513242251 is 152242315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 513242251 - 2³ = 513242243 is a prime.

It is not a weakly prime, because it can be changed into another prime (513242351) 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 as a sum of consecutive naturals, namely, 256621125 + 256621126.

It is an arithmetic number, because the mean of its divisors is an integer number (256621126).

Almost surely, 2^513242251 is an apocalyptic number.

513242251 is a deficient number, since it is larger than the sum of its proper divisors (1).

513242251 is an equidigital number, since it uses as much as digits as its factorization.

513242251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 513242251 is about 22654.8504960858. The cubic root of 513242251 is about 800.6464831628.

Adding to 513242251 its reverse (152242315), we get a palindrome (665484566).

The spelling of 513242251 in words is "five hundred thirteen million, two hundred forty-two thousand, two hundred fifty-one".