1091386487 has 4 divisors (see below), whose sum is σ = 1091502720. Its totient is φ = 1091270256.

The previous prime is 1091386433. The next prime is 1091386489. The reversal of 1091386487 is 7846831901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091386487 is a prime.

It is a super-2 number, since 2×1091386487² = 2382248928012402338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091386489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42662 + ... + 63267.

It is an arithmetic number, because the mean of its divisors is an integer number (272875680).

Almost surely, 2^1091386487 is an apocalyptic number.

1091386487 is a deficient number, since it is larger than the sum of its proper divisors (116233).

1091386487 is a wasteful number, since it uses less digits than its factorization.

1091386487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116232.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 1091386487 is about 33036.1391055311. The cubic root of 1091386487 is about 1029.5786402940.

The spelling of 1091386487 in words is "one billion, ninety-one million, three hundred eighty-six thousand, four hundred eighty-seven".