1964427961 has 2 divisors, whose sum is σ = 1964427962. Its totient is φ = 1964427960.

The previous prime is 1964427937. The next prime is 1964427967. The reversal of 1964427961 is 1697244691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1828845225 + 135582736 = 42765^2 + 11644^2 .

It is a cyclic number.

It is not a de Polignac number, because 1964427961 - 2²⁷ = 1830210233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1964427967) 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, 982213980 + 982213981.

It is an arithmetic number, because the mean of its divisors is an integer number (982213981).

Almost surely, 2^1964427961 is an apocalyptic number.

It is an amenable number.

1964427961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964427961 is an equidigital number, since it uses as much as digits as its factorization.

1964427961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 1964427961 is about 44321.8677517092. The cubic root of 1964427961 is about 1252.4066617563.

The spelling of 1964427961 in words is "one billion, nine hundred sixty-four million, four hundred twenty-seven thousand, nine hundred sixty-one".