196557091 has 4 divisors (see below), whose sum is σ = 196603432. Its totient is φ = 196510752.

The previous prime is 196557083. The next prime is 196557121. The reversal of 196557091 is 190755691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 196557091 - 2³ = 196557083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196557001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16086 + ... + 25531.

It is an arithmetic number, because the mean of its divisors is an integer number (49150858).

Almost surely, 2^196557091 is an apocalyptic number.

196557091 is a deficient number, since it is larger than the sum of its proper divisors (46341).

196557091 is an equidigital number, since it uses as much as digits as its factorization.

196557091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46340.

The product of its (nonzero) digits is 85050, while the sum is 43.

The square root of 196557091 is about 14019.8819895176. The cubic root of 196557091 is about 581.4283966844.

The spelling of 196557091 in words is "one hundred ninety-six million, five hundred fifty-seven thousand, ninety-one".