196557121 has 2 divisors, whose sum is σ = 196557122. Its totient is φ = 196557120.

The previous prime is 196557083. The next prime is 196557133. The reversal of 196557121 is 121755691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160376896 + 36180225 = 12664^2 + 6015^2 .

It is a cyclic number.

It is not a de Polignac number, because 196557121 - 2²⁵ = 163002689 is a prime.

It is not a weakly prime, because it can be changed into another prime (196557191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98278560 + 98278561.

It is an arithmetic number, because the mean of its divisors is an integer number (98278561).

Almost surely, 2^196557121 is an apocalyptic number.

It is an amenable number.

196557121 is a deficient number, since it is larger than the sum of its proper divisors (1).

196557121 is an equidigital number, since it uses as much as digits as its factorization.

196557121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 37.

The square root of 196557121 is about 14019.8830594267. The cubic root of 196557121 is about 581.4284262650.

The spelling of 196557121 in words is "one hundred ninety-six million, five hundred fifty-seven thousand, one hundred twenty-one".