851550871 has 2 divisors, whose sum is σ = 851550872. Its totient is φ = 851550870.

The previous prime is 851550863. The next prime is 851550877. The reversal of 851550871 is 178055158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 851550871 - 2³ = 851550863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851550877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425775435 + 425775436.

It is an arithmetic number, because the mean of its divisors is an integer number (425775436).

Almost surely, 2^851550871 is an apocalyptic number.

851550871 is a deficient number, since it is larger than the sum of its proper divisors (1).

851550871 is an equidigital number, since it uses as much as digits as its factorization.

851550871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56000, while the sum is 40.

The square root of 851550871 is about 29181.3445714895. The cubic root of 851550871 is about 947.8440012111.

The spelling of 851550871 in words is "eight hundred fifty-one million, five hundred fifty thousand, eight hundred seventy-one".