1011964561 has 2 divisors, whose sum is σ = 1011964562. Its totient is φ = 1011964560.

The previous prime is 1011964553. The next prime is 1011964571. The reversal of 1011964561 is 1654691101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 760932225 + 251032336 = 27585^2 + 15844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011964561 - 2³ = 1011964553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011964531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505982280 + 505982281.

It is an arithmetic number, because the mean of its divisors is an integer number (505982281).

Almost surely, 2^1011964561 is an apocalyptic number.

It is an amenable number.

1011964561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011964561 is an equidigital number, since it uses as much as digits as its factorization.

1011964561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1011964561 is about 31811.3904285871. The cubic root of 1011964561 is about 1003.9723862529.

The spelling of 1011964561 in words is "one billion, eleven million, nine hundred sixty-four thousand, five hundred sixty-one".