255157993 has 6 divisors (see below), whose sum is σ = 263655402. Its totient is φ = 246926160.

The previous prime is 255157963. The next prime is 255157997. The reversal of 255157993 is 399751552.

It can be written as a sum of positive squares in only one way, i.e., 247024089 + 8133904 = 15717^2 + 2852^2 .

It is not a de Polignac number, because 255157993 - 2⁵ = 255157961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255157997) 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 5 ways as a sum of consecutive naturals, for example, 131796 + ... + 133717.

It is an arithmetic number, because the mean of its divisors is an integer number (43942567).

Almost surely, 2^255157993 is an apocalyptic number.

It is an amenable number.

255157993 is a deficient number, since it is larger than the sum of its proper divisors (8497409).

255157993 is an equidigital number, since it uses as much as digits as its factorization.

255157993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265575 (or 265544 counting only the distinct ones).

The product of its digits is 425250, while the sum is 46.

The square root of 255157993 is about 15973.6656093709. The cubic root of 255157993 is about 634.2635088689.

The spelling of 255157993 in words is "two hundred fifty-five million, one hundred fifty-seven thousand, nine hundred ninety-three".