1256516223 has 24 divisors (see below), whose sum is σ = 1804172688. Its totient is φ = 777563136.

The previous prime is 1256516221. The next prime is 1256516231. The reversal of 1256516223 is 3226156521.

It is not a de Polignac number, because 1256516223 - 2¹ = 1256516221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256516221) 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, 53365 + ... + 73217.

It is an arithmetic number, because the mean of its divisors is an integer number (75173862).

Almost surely, 2^1256516223 is an apocalyptic number.

1256516223 is a deficient number, since it is larger than the sum of its proper divisors (547656465).

1256516223 is a wasteful number, since it uses less digits than its factorization.

1256516223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19963 (or 19946 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 1256516223 is about 35447.3725824637. The cubic root of 1256516223 is about 1079.0859387053.

The spelling of 1256516223 in words is "one billion, two hundred fifty-six million, five hundred sixteen thousand, two hundred twenty-three".