1123861587 has 4 divisors (see below), whose sum is σ = 1498482120. Its totient is φ = 749241056.

The previous prime is 1123861573. The next prime is 1123861589. The reversal of 1123861587 is 7851683211.

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

It is a cyclic number.

It is not a de Polignac number, because 1123861587 - 2¹² = 1123857491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1123861589) 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, 187310262 + ... + 187310267.

It is an arithmetic number, because the mean of its divisors is an integer number (374620530).

Almost surely, 2^1123861587 is an apocalyptic number.

1123861587 is a deficient number, since it is larger than the sum of its proper divisors (374620533).

1123861587 is an equidigital number, since it uses as much as digits as its factorization.

1123861587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374620532.

The product of its digits is 80640, while the sum is 42.

The square root of 1123861587 is about 33524.0449080954. The cubic root of 1123861587 is about 1039.6909791323.

The spelling of 1123861587 in words is "one billion, one hundred twenty-three million, eight hundred sixty-one thousand, five hundred eighty-seven".