1256441550 has 192 divisors, whose sum is σ = 3884751360. Its totient is φ = 261665280.

The previous prime is 1256441507. The next prime is 1256441561. The reversal of 1256441550 is 551446521.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 1132396 + ... + 1133504.

It is an arithmetic number, because the mean of its divisors is an integer number (20233080).

Almost surely, 2^1256441550 is an apocalyptic number.

1256441550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256441550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1942375680).

1256441550 is an abundant number, since it is smaller than the sum of its proper divisors (2628309810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256441550 is a wasteful number, since it uses less digits than its factorization.

1256441550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227 (or 1222 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 1256441550 is about 35446.3192729513. The cubic root of 1256441550 is about 1079.0645620930.

The spelling of 1256441550 in words is "one billion, two hundred fifty-six million, four hundred forty-one thousand, five hundred fifty".