1256113503 has 24 divisors (see below), whose sum is σ = 1912941680. Its totient is φ = 792063360.

The previous prime is 1256113499. The next prime is 1256113517. The reversal of 1256113503 is 3053116521.

1256113503 is a `hidden beast` number, since 12 + 5 + 611 + 35 + 0 + 3 = 666.

It is not a de Polignac number, because 1256113503 - 2² = 1256113499 is a prime.

It is a super-2 number, since 2×1256113503² = 3155642264837862018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256113003) 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 in 23 ways as a sum of consecutive naturals, for example, 107475 + ... + 118587.

Almost surely, 2^1256113503 is an apocalyptic number.

1256113503 is a deficient number, since it is larger than the sum of its proper divisors (656828177).

1256113503 is a wasteful number, since it uses less digits than its factorization.

1256113503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11799 (or 11796 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1256113503 is about 35441.6915933763. The cubic root of 1256113503 is about 1078.9706421638.

The spelling of 1256113503 in words is "one billion, two hundred fifty-six million, one hundred thirteen thousand, five hundred three".