256912130 has 16 divisors (see below), whose sum is σ = 462647160. Its totient is φ = 102719232.

The previous prime is 256912087. The next prime is 256912133. The reversal of 256912130 is 31219652.

It can be written as a sum of positive squares in 4 ways, for example, as 253733041 + 3179089 = 15929^2 + 1783^2 .

It is a super-2 number, since 2×256912130² = 132007685082273800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256912093 and 256912102.

It is not an unprimeable number, because it can be changed into a prime (256912133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26732 + ... + 35048.

Almost surely, 2^256912130 is an apocalyptic number.

256912130 is a deficient number, since it is larger than the sum of its proper divisors (205735030).

256912130 is a wasteful number, since it uses less digits than its factorization.

256912130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11413.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 256912130 is about 16028.4787175827. The cubic root of 256912130 is about 635.7136498872.

The spelling of 256912130 in words is "two hundred fifty-six million, nine hundred twelve thousand, one hundred thirty".