256021741 has 4 divisors (see below), whose sum is σ = 256056192. Its totient is φ = 255987292.

The previous prime is 256021739. The next prime is 256021781. The reversal of 256021741 is 147120652.

256021741 = T₁₃₀₆₃ + T₁₃₀₆₄ + T₁₃₀₆₅.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 256021741 - 2¹ = 256021739 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 (256021781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955 + ... + 22648.

It is an arithmetic number, because the mean of its divisors is an integer number (64014048).

Almost surely, 2^256021741 is an apocalyptic number.

256021741 is the 13065-th centered triangular number.

It is an amenable number.

256021741 is a deficient number, since it is larger than the sum of its proper divisors (34451).

256021741 is a wasteful number, since it uses less digits than its factorization.

256021741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34450.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 256021741 is about 16000.6793918258. The cubic root of 256021741 is about 634.9783951151.

The spelling of 256021741 in words is "two hundred fifty-six million, twenty-one thousand, seven hundred forty-one".