1091794661 has 2 divisors, whose sum is σ = 1091794662. Its totient is φ = 1091794660.

The previous prime is 1091794657. The next prime is 1091794679. The reversal of 1091794661 is 1664971901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1081752100 + 10042561 = 32890^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091794661 - 2² = 1091794657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091094661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545897330 + 545897331.

It is an arithmetic number, because the mean of its divisors is an integer number (545897331).

Almost surely, 2^1091794661 is an apocalyptic number.

It is an amenable number.

1091794661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091794661 is an equidigital number, since it uses as much as digits as its factorization.

1091794661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 1091794661 is about 33042.3162172388. The cubic root of 1091794661 is about 1029.7069770038.

The spelling of 1091794661 in words is "one billion, ninety-one million, seven hundred ninety-four thousand, six hundred sixty-one".