1256823473 has 2 divisors, whose sum is σ = 1256823474. Its totient is φ = 1256823472.

The previous prime is 1256823461. The next prime is 1256823521. The reversal of 1256823473 is 3743286521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151719969 + 105103504 = 33937^2 + 10252^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256823473 - 2¹⁰ = 1256822449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1256823473.

It is not a weakly prime, because it can be changed into another prime (1256829473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628411736 + 628411737.

It is an arithmetic number, because the mean of its divisors is an integer number (628411737).

Almost surely, 2^1256823473 is an apocalyptic number.

It is an amenable number.

1256823473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256823473 is an equidigital number, since it uses as much as digits as its factorization.

1256823473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 41.

The square root of 1256823473 is about 35451.7062071771. The cubic root of 1256823473 is about 1079.1738861397.

The spelling of 1256823473 in words is "one billion, two hundred fifty-six million, eight hundred twenty-three thousand, four hundred seventy-three".