851616091 has 2 divisors, whose sum is σ = 851616092. Its totient is φ = 851616090.

The previous prime is 851616083. The next prime is 851616107. The reversal of 851616091 is 190616158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851616091 - 2³ = 851616083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 851616091.

It is not a weakly prime, because it can be changed into another prime (851616191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425808045 + 425808046.

It is an arithmetic number, because the mean of its divisors is an integer number (425808046).

Almost surely, 2^851616091 is an apocalyptic number.

851616091 is a deficient number, since it is larger than the sum of its proper divisors (1).

851616091 is an equidigital number, since it uses as much as digits as its factorization.

851616091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 851616091 is about 29182.4620448652. The cubic root of 851616091 is about 947.8681989464.

The spelling of 851616091 in words is "eight hundred fifty-one million, six hundred sixteen thousand, ninety-one".