1091432887 has 2 divisors, whose sum is σ = 1091432888. Its totient is φ = 1091432886.

The previous prime is 1091432873. The next prime is 1091432939. The reversal of 1091432887 is 7882341901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1091432887 - 2²⁷ = 957215159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091432387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545716443 + 545716444.

It is an arithmetic number, because the mean of its divisors is an integer number (545716444).

Almost surely, 2^1091432887 is an apocalyptic number.

1091432887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091432887 is an equidigital number, since it uses as much as digits as its factorization.

1091432887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1091432887 is about 33036.8413593067. The cubic root of 1091432887 is about 1029.5932308393.

The spelling of 1091432887 in words is "one billion, ninety-one million, four hundred thirty-two thousand, eight hundred eighty-seven".