855903197 has 2 divisors, whose sum is σ = 855903198. Its totient is φ = 855903196.

The previous prime is 855903193. The next prime is 855903247. The reversal of 855903197 is 791309558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 708304996 + 147598201 = 26614^2 + 12149^2 .

It is a cyclic number.

It is not a de Polignac number, because 855903197 - 2² = 855903193 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855903193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427951598 + 427951599.

It is an arithmetic number, because the mean of its divisors is an integer number (427951599).

Almost surely, 2^855903197 is an apocalyptic number.

It is an amenable number.

855903197 is a deficient number, since it is larger than the sum of its proper divisors (1).

855903197 is an equidigital number, since it uses as much as digits as its factorization.

855903197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 855903197 is about 29255.8233006696. The cubic root of 855903197 is about 949.4560864308.

The spelling of 855903197 in words is "eight hundred fifty-five million, nine hundred three thousand, one hundred ninety-seven".