256104551 has 8 divisors (see below), whose sum is σ = 264708864. Its totient is φ = 247631800.

The previous prime is 256104509. The next prime is 256104557. The reversal of 256104551 is 155401652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256104551 - 2¹⁴ = 256088167 is a prime.

It is a super-3 number, since 3×256104551³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256104557) 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, 28925 + ... + 36726.

It is an arithmetic number, because the mean of its divisors is an integer number (33088608).

Almost surely, 2^256104551 is an apocalyptic number.

256104551 is a deficient number, since it is larger than the sum of its proper divisors (8604313).

256104551 is an equidigital number, since it uses as much as digits as its factorization.

256104551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65781.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 256104551 is about 16003.2668852332. The cubic root of 256104551 is about 635.0468487972.

The spelling of 256104551 in words is "two hundred fifty-six million, one hundred four thousand, five hundred fifty-one".