1964221447 has 2 divisors, whose sum is σ = 1964221448. Its totient is φ = 1964221446.

The previous prime is 1964221421. The next prime is 1964221487. The reversal of 1964221447 is 7441224691.

It is an a-pointer prime, because the next prime (1964221487) can be obtained adding 1964221447 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1964221447 - 2¹⁹ = 1963697159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1964221487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982110723 + 982110724.

It is an arithmetic number, because the mean of its divisors is an integer number (982110724).

Almost surely, 2^1964221447 is an apocalyptic number.

1964221447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964221447 is an equidigital number, since it uses as much as digits as its factorization.

1964221447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 1964221447 is about 44319.5379827001. The cubic root of 1964221447 is about 1252.3627730555.

The spelling of 1964221447 in words is "one billion, nine hundred sixty-four million, two hundred twenty-one thousand, four hundred forty-seven".