1094387561 has 2 divisors, whose sum is σ = 1094387562. Its totient is φ = 1094387560.

The previous prime is 1094387557. The next prime is 1094387579. The reversal of 1094387561 is 1657834901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670810000 + 423577561 = 25900^2 + 20581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1094387561 - 2² = 1094387557 is a prime.

It is not a weakly prime, because it can be changed into another prime (1094347561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547193780 + 547193781.

It is an arithmetic number, because the mean of its divisors is an integer number (547193781).

Almost surely, 2^1094387561 is an apocalyptic number.

It is an amenable number.

1094387561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1094387561 is an equidigital number, since it uses as much as digits as its factorization.

1094387561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 1094387561 is about 33081.5290003349. The cubic root of 1094387561 is about 1030.5214819345.

The spelling of 1094387561 in words is "one billion, ninety-four million, three hundred eighty-seven thousand, five hundred sixty-one".