196421749 has 2 divisors, whose sum is σ = 196421750. Its totient is φ = 196421748.

The previous prime is 196421707. The next prime is 196421761. The reversal of 196421749 is 947124691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173448900 + 22972849 = 13170^2 + 4793^2 .

It is a cyclic number.

It is not a de Polignac number, because 196421749 - 2⁹ = 196421237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196821749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98210874 + 98210875.

It is an arithmetic number, because the mean of its divisors is an integer number (98210875).

Almost surely, 2^196421749 is an apocalyptic number.

It is an amenable number.

196421749 is a deficient number, since it is larger than the sum of its proper divisors (1).

196421749 is an equidigital number, since it uses as much as digits as its factorization.

196421749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 196421749 is about 14015.0543702121. The cubic root of 196421749 is about 581.2949159571.

The spelling of 196421749 in words is "one hundred ninety-six million, four hundred twenty-one thousand, seven hundred forty-nine".