1091009243 has 2 divisors, whose sum is σ = 1091009244. Its totient is φ = 1091009242.

The previous prime is 1091009191. The next prime is 1091009251. The reversal of 1091009243 is 3429001901.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1091009243 - 2¹² = 1091005147 is a prime.

It is a super-2 number, since 2×1091009243² = 2380602336622866098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1091009743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545504621 + 545504622.

It is an arithmetic number, because the mean of its divisors is an integer number (545504622).

Almost surely, 2^1091009243 is an apocalyptic number.

1091009243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091009243 is an equidigital number, since it uses as much as digits as its factorization.

1091009243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1091009243 is about 33030.4290465625. The cubic root of 1091009243 is about 1029.4600000357.

The spelling of 1091009243 in words is "one billion, ninety-one million, nine thousand, two hundred forty-three".