256353129 has 6 divisors (see below), whose sum is σ = 370287866. Its totient is φ = 170902080.

The previous prime is 256353121. The next prime is 256353137. The reversal of 256353129 is 921353652.

256353129 is a `hidden beast` number, since 2 + 5 + 635 + 3 + 12 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (256353121) and next prime (256353137).

It can be written as a sum of positive squares in only one way, i.e., 161874729 + 94478400 = 12723^2 + 9720^2 .

It is not a de Polignac number, because 256353129 - 2³ = 256353121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256353093 and 256353102.

It is not an unprimeable number, because it can be changed into a prime (256353121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14241832 + ... + 14241849.

Almost surely, 2^256353129 is an apocalyptic number.

It is an amenable number.

256353129 is a deficient number, since it is larger than the sum of its proper divisors (113934737).

256353129 is a wasteful number, since it uses less digits than its factorization.

256353129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28483687 (or 28483684 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 256353129 is about 16011.0314783277. The cubic root of 256353129 is about 635.2522435983.

The spelling of 256353129 in words is "two hundred fifty-six million, three hundred fifty-three thousand, one hundred twenty-nine".