256191550 has 48 divisors (see below), whose sum is σ = 487125072. Its totient is φ = 100224000.

The previous prime is 256191517. The next prime is 256191569. The reversal of 256191550 is 55191652.

It is a super-2 number, since 2×256191550² = 131268220582805000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 489589 + ... + 490111.

It is an arithmetic number, because the mean of its divisors is an integer number (10148439).

Almost surely, 2^256191550 is an apocalyptic number.

256191550 is a deficient number, since it is larger than the sum of its proper divisors (230933522).

256191550 is a wasteful number, since it uses less digits than its factorization.

256191550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 34.

The square root of 256191550 is about 16005.9848181860. The cubic root of 256191550 is about 635.1187493625.

The spelling of 256191550 in words is "two hundred fifty-six million, one hundred ninety-one thousand, five hundred fifty".