1091873869 has 2 divisors, whose sum is σ = 1091873870. Its totient is φ = 1091873868.

The previous prime is 1091873863. The next prime is 1091873929. The reversal of 1091873869 is 9683781901.

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., 623151369 + 468722500 = 24963^2 + 21650^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091873869 - 2⁵ = 1091873837 is a prime.

It is a super-2 number, since 2×1091873869² = 2384377091610058322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091873863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545936934 + 545936935.

It is an arithmetic number, because the mean of its divisors is an integer number (545936935).

Almost surely, 2^1091873869 is an apocalyptic number.

It is an amenable number.

1091873869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091873869 is an equidigital number, since it uses as much as digits as its factorization.

1091873869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 1091873869 is about 33043.5147797567. The cubic root of 1091873869 is about 1029.7318776135.

The spelling of 1091873869 in words is "one billion, ninety-one million, eight hundred seventy-three thousand, eight hundred sixty-nine".