1194487975649 has 2 divisors, whose sum is σ = 1194487975650. Its totient is φ = 1194487975648.

The previous prime is 1194487975609. The next prime is 1194487975657. The reversal of 1194487975649 is 9465797844911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1164225894049 + 30262081600 = 1078993^2 + 173960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1194487975649 - 2⁸ = 1194487975393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1194487975609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 597243987824 + 597243987825.

It is an arithmetic number, because the mean of its divisors is an integer number (597243987825).

Almost surely, 2^{1194487975649} is an apocalyptic number.

It is an amenable number.

1194487975649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1194487975649 is an equidigital number, since it uses as much as digits as its factorization.

1194487975649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 548674560, while the sum is 74.

The spelling of 1194487975649 in words is "one trillion, one hundred ninety-four billion, four hundred eighty-seven million, nine hundred seventy-five thousand, six hundred forty-nine".