855398251 has 2 divisors, whose sum is σ = 855398252. Its totient is φ = 855398250.

The previous prime is 855398233. The next prime is 855398263. The reversal of 855398251 is 152893558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855398251 - 2¹³ = 855390059 is a prime.

It is not a weakly prime, because it can be changed into another prime (855398281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427699125 + 427699126.

It is an arithmetic number, because the mean of its divisors is an integer number (427699126).

Almost surely, 2^855398251 is an apocalyptic number.

855398251 is a deficient number, since it is larger than the sum of its proper divisors (1).

855398251 is an equidigital number, since it uses as much as digits as its factorization.

855398251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 46.

The square root of 855398251 is about 29247.1921900206. The cubic root of 855398251 is about 949.2693369769.

The spelling of 855398251 in words is "eight hundred fifty-five million, three hundred ninety-eight thousand, two hundred fifty-one".