256030551 has 20 divisors (see below), whose sum is σ = 437104272. Its totient is φ = 146302848.

The previous prime is 256030513. The next prime is 256030553. The reversal of 256030551 is 155030652.

256030551 is a `hidden beast` number, since 2 + 5 + 603 + 0 + 5 + 51 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-256030551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256030553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 225210 + ... + 226343.

Almost surely, 2^256030551 is an apocalyptic number.

256030551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

256030551 is a deficient number, since it is larger than the sum of its proper divisors (181073721).

256030551 is an equidigital number, since it uses as much as digits as its factorization.

256030551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451572 (or 451563 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 256030551 is about 16000.9546902677. The cubic root of 256030551 is about 634.9856784750.

The spelling of 256030551 in words is "two hundred fifty-six million, thirty thousand, five hundred fifty-one".