196455851 has 2 divisors, whose sum is σ = 196455852. Its totient is φ = 196455850.

The previous prime is 196455803. The next prime is 196455869. The reversal of 196455851 is 158554691.

It is a strong prime.

It is an emirp because it is prime and its reverse (158554691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 196455851 - 2²² = 192261547 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (196455871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98227925 + 98227926.

It is an arithmetic number, because the mean of its divisors is an integer number (98227926).

Almost surely, 2^196455851 is an apocalyptic number.

196455851 is a deficient number, since it is larger than the sum of its proper divisors (1).

196455851 is an equidigital number, since it uses as much as digits as its factorization.

196455851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 44.

The square root of 196455851 is about 14016.2709377352. The cubic root of 196455851 is about 581.3285547509.

The spelling of 196455851 in words is "one hundred ninety-six million, four hundred fifty-five thousand, eight hundred fifty-one".