196549781489 has 2 divisors, whose sum is σ = 196549781490. Its totient is φ = 196549781488.

The previous prime is 196549781437. The next prime is 196549781581. The reversal of 196549781489 is 984187945691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177830890000 + 18718891489 = 421700^2 + 136817^2 .

It is a cyclic number.

It is not a de Polignac number, because 196549781489 - 2³⁶ = 127830304753 is a prime.

It is not a weakly prime, because it can be changed into another prime (196549781789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98274890744 + 98274890745.

It is an arithmetic number, because the mean of its divisors is an integer number (98274890745).

Almost surely, 2^196549781489 is an apocalyptic number.

It is an amenable number.

196549781489 is a deficient number, since it is larger than the sum of its proper divisors (1).

196549781489 is an equidigital number, since it uses as much as digits as its factorization.

196549781489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156764160, while the sum is 71.

The spelling of 196549781489 in words is "one hundred ninety-six billion, five hundred forty-nine million, seven hundred eighty-one thousand, four hundred eighty-nine".