813125221297 has 2 divisors, whose sum is σ = 813125221298. Its totient is φ = 813125221296.

The previous prime is 813125221277. The next prime is 813125221327. The reversal of 813125221297 is 792122521318.

813125221297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636127475776 + 176997745521 = 797576^2 + 420711^2 .

It is a cyclic number.

It is not a de Polignac number, because 813125221297 - 2¹⁹ = 813124697009 is a prime.

It is a super-2 number, since 2×813125221297² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (813125221217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406562610648 + 406562610649.

It is an arithmetic number, because the mean of its divisors is an integer number (406562610649).

Almost surely, 2^813125221297 is an apocalyptic number.

It is an amenable number.

813125221297 is a deficient number, since it is larger than the sum of its proper divisors (1).

813125221297 is an equidigital number, since it uses as much as digits as its factorization.

813125221297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The spelling of 813125221297 in words is "eight hundred thirteen billion, one hundred twenty-five million, two hundred twenty-one thousand, two hundred ninety-seven".