815125154813 has 2 divisors, whose sum is σ = 815125154814. Its totient is φ = 815125154812.

The previous prime is 815125154801. The next prime is 815125154849. The reversal of 815125154813 is 318451521518.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 809634641209 + 5490513604 = 899797^2 + 74098^2 .

It is a cyclic number.

It is not a de Polignac number, because 815125154813 - 2¹⁶ = 815125089277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815125154113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407562577406 + 407562577407.

It is an arithmetic number, because the mean of its divisors is an integer number (407562577407).

Almost surely, 2^815125154813 is an apocalyptic number.

It is an amenable number.

815125154813 is a deficient number, since it is larger than the sum of its proper divisors (1).

815125154813 is an equidigital number, since it uses as much as digits as its factorization.

815125154813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192000, while the sum is 44.

It can be divided in two parts, 81512 and 5154813, that added together give a palindrome (5236325).

The spelling of 815125154813 in words is "eight hundred fifteen billion, one hundred twenty-five million, one hundred fifty-four thousand, eight hundred thirteen".