255807197 has 4 divisors (see below), whose sum is σ = 256877760. Its totient is φ = 254736636.

The previous prime is 255807191. The next prime is 255807199. The reversal of 255807197 is 791708552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255807197 - 2¹² = 255803101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255807191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534923 + ... + 535400.

It is an arithmetic number, because the mean of its divisors is an integer number (64219440).

Almost surely, 2^255807197 is an apocalyptic number.

It is an amenable number.

255807197 is a deficient number, since it is larger than the sum of its proper divisors (1070563).

255807197 is a wasteful number, since it uses less digits than its factorization.

255807197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070562.

The product of its (nonzero) digits is 176400, while the sum is 44.

The square root of 255807197 is about 15993.9737713928. The cubic root of 255807197 is about 634.8009767502.

The spelling of 255807197 in words is "two hundred fifty-five million, eight hundred seven thousand, one hundred ninety-seven".