1256887253 has 4 divisors (see below), whose sum is σ = 1257268140. Its totient is φ = 1256506368.

The previous prime is 1256887201. The next prime is 1256887271. The reversal of 1256887253 is 3527886521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3527886521 = 31 ⋅113802791.

It can be written as a sum of positive squares in 2 ways, for example, as 221206129 + 1035681124 = 14873^2 + 32182^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256887253 - 2⁶ = 1256887189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1256887198 and 1256887207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256887273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185450 + ... + 192107.

It is an arithmetic number, because the mean of its divisors is an integer number (314317035).

Almost surely, 2^1256887253 is an apocalyptic number.

It is an amenable number.

1256887253 is a deficient number, since it is larger than the sum of its proper divisors (380887).

1256887253 is an equidigital number, since it uses as much as digits as its factorization.

1256887253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380886.

The product of its digits is 806400, while the sum is 47.

The square root of 1256887253 is about 35452.6057293396. The cubic root of 1256887253 is about 1079.1921407707.

The spelling of 1256887253 in words is "one billion, two hundred fifty-six million, eight hundred eighty-seven thousand, two hundred fifty-three".