256681925 has 12 divisors (see below), whose sum is σ = 335038080. Its totient is φ = 194537520.

The previous prime is 256681903. The next prime is 256681933. The reversal of 256681925 is 529186652.

It is not a de Polignac number, because 256681925 - 2⁸ = 256681669 is a prime.

It is a super-2 number, since 2×256681925² = 131771221243411250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 269717 + ... + 270666.

It is an arithmetic number, because the mean of its divisors is an integer number (27919840).

Almost surely, 2^256681925 is an apocalyptic number.

256681925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256681925 is a deficient number, since it is larger than the sum of its proper divisors (78356155).

256681925 is a wasteful number, since it uses less digits than its factorization.

256681925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540412 (or 540407 counting only the distinct ones).

The product of its digits is 259200, while the sum is 44.

The square root of 256681925 is about 16021.2959837836. The cubic root of 256681925 is about 635.5237169933.

The spelling of 256681925 in words is "two hundred fifty-six million, six hundred eighty-one thousand, nine hundred twenty-five".