1964391197 has 2 divisors, whose sum is σ = 1964391198. Its totient is φ = 1964391196.

The previous prime is 1964391181. The next prime is 1964391203. The reversal of 1964391197 is 7911934691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1135757401 + 828633796 = 33701^2 + 28786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1964391197 - 2⁴ = 1964391181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1964391127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982195598 + 982195599.

It is an arithmetic number, because the mean of its divisors is an integer number (982195599).

Almost surely, 2^1964391197 is an apocalyptic number.

It is an amenable number.

1964391197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964391197 is an equidigital number, since it uses as much as digits as its factorization.

1964391197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 50.

The square root of 1964391197 is about 44321.4530109291. The cubic root of 1964391197 is about 1252.3988488345.

The spelling of 1964391197 in words is "one billion, nine hundred sixty-four million, three hundred ninety-one thousand, one hundred ninety-seven".