2581246813 has 2 divisors, whose sum is σ = 2581246814. Its totient is φ = 2581246812.

The previous prime is 2581246807. The next prime is 2581246831. The reversal of 2581246813 is 3186421852.

Together with next prime (2581246831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2210222169 + 371024644 = 47013^2 + 19262^2 .

It is a cyclic number.

It is not a de Polignac number, because 2581246813 - 2⁹ = 2581246301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2581246013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290623406 + 1290623407.

It is an arithmetic number, because the mean of its divisors is an integer number (1290623407).

Almost surely, 2^2581246813 is an apocalyptic number.

It is an amenable number.

2581246813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581246813 is an equidigital number, since it uses as much as digits as its factorization.

2581246813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 40.

The square root of 2581246813 is about 50805.9722178407. The cubic root of 2581246813 is about 1371.7548707191.

The spelling of 2581246813 in words is "two billion, five hundred eighty-one million, two hundred forty-six thousand, eight hundred thirteen".