1256455013 has 4 divisors (see below), whose sum is σ = 1370678208. Its totient is φ = 1142231820.

The previous prime is 1256455007. The next prime is 1256455021. The reversal of 1256455013 is 3105546521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1256455013 - 2¹⁸ = 1256192869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256458013) 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 3 ways as a sum of consecutive naturals, for example, 57111581 + ... + 57111602.

It is an arithmetic number, because the mean of its divisors is an integer number (342669552).

Almost surely, 2^1256455013 is an apocalyptic number.

It is an amenable number.

1256455013 is a deficient number, since it is larger than the sum of its proper divisors (114223195).

1256455013 is a wasteful number, since it uses less digits than its factorization.

1256455013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114223194.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1256455013 is about 35446.5091793254. The cubic root of 1256455013 is about 1079.0684162036.

The spelling of 1256455013 in words is "one billion, two hundred fifty-six million, four hundred fifty-five thousand, thirteen".