256956133 has 8 divisors (see below), whose sum is σ = 309120320. Its totient is φ = 208656000.

The previous prime is 256956121. The next prime is 256956149. The reversal of 256956133 is 331659652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256956133 - 2⁵ = 256956101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256956103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965868 + ... + 966133.

It is an arithmetic number, because the mean of its divisors is an integer number (38640040).

Almost surely, 2^256956133 is an apocalyptic number.

It is an amenable number.

256956133 is a deficient number, since it is larger than the sum of its proper divisors (52164187).

256956133 is a wasteful number, since it uses less digits than its factorization.

256956133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932027.

The product of its digits is 145800, while the sum is 40.

The square root of 256956133 is about 16029.8513093541. The cubic root of 256956133 is about 635.7499420764.

The spelling of 256956133 in words is "two hundred fifty-six million, nine hundred fifty-six thousand, one hundred thirty-three".