256926109 has 16 divisors (see below), whose sum is σ = 299312640. Its totient is φ = 218232000.

The previous prime is 256926107. The next prime is 256926127. The reversal of 256926109 is 901629652.

256926109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 256926109 - 2¹ = 256926107 is a prime.

It is a super-2 number, since 2×256926109² = 132022050971759762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256926107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3102 + ... + 22879.

It is an arithmetic number, because the mean of its divisors is an integer number (18707040).

Almost surely, 2^256926109 is an apocalyptic number.

256926109 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

256926109 is a deficient number, since it is larger than the sum of its proper divisors (42386531).

256926109 is a wasteful number, since it uses less digits than its factorization.

256926109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26052.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 256926109 is about 16028.9147792357. The cubic root of 256926109 is about 635.7251797437.

The spelling of 256926109 in words is "two hundred fifty-six million, nine hundred twenty-six thousand, one hundred nine".