1091320501 has 2 divisors, whose sum is σ = 1091320502. Its totient is φ = 1091320500.

The previous prime is 1091320487. The next prime is 1091320567. The reversal of 1091320501 is 1050231901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1003242276 + 88078225 = 31674^2 + 9385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091320501 - 2⁵ = 1091320469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091320591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545660250 + 545660251.

It is an arithmetic number, because the mean of its divisors is an integer number (545660251).

Almost surely, 2^1091320501 is an apocalyptic number.

It is an amenable number.

1091320501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091320501 is an equidigital number, since it uses as much as digits as its factorization.

1091320501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 1091320501 is about 33035.1403962508. The cubic root of 1091320501 is about 1029.5578901912.

The spelling of 1091320501 in words is "one billion, ninety-one million, three hundred twenty thousand, five hundred one".