840513251 has 2 divisors, whose sum is σ = 840513252. Its totient is φ = 840513250.

The previous prime is 840513239. The next prime is 840513257. The reversal of 840513251 is 152315048.

840513251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840513251 - 2¹⁰ = 840512227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840513257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420256625 + 420256626.

It is an arithmetic number, because the mean of its divisors is an integer number (420256626).

Almost surely, 2^840513251 is an apocalyptic number.

840513251 is a deficient number, since it is larger than the sum of its proper divisors (1).

840513251 is an equidigital number, since it uses as much as digits as its factorization.

840513251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 840513251 is about 28991.6065612101. The cubic root of 840513251 is about 943.7309284569.

Adding to 840513251 its reverse (152315048), we get a palindrome (992828299).

The spelling of 840513251 in words is "eight hundred forty million, five hundred thirteen thousand, two hundred fifty-one".