1121586987 has 4 divisors (see below), whose sum is σ = 1495449320. Its totient is φ = 747724656.

The previous prime is 1121586941. The next prime is 1121586997. The reversal of 1121586987 is 7896851211.

It is a happy number.

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

It is not a de Polignac number, because 1121586987 - 2⁷ = 1121586859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121586997) 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, 186931162 + ... + 186931167.

It is an arithmetic number, because the mean of its divisors is an integer number (373862330).

Almost surely, 2^1121586987 is an apocalyptic number.

1121586987 is a deficient number, since it is larger than the sum of its proper divisors (373862333).

1121586987 is an equidigital number, since it uses as much as digits as its factorization.

1121586987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373862332.

The product of its digits is 241920, while the sum is 48.

The square root of 1121586987 is about 33490.1028215800. The cubic root of 1121586987 is about 1038.9890901085.

The spelling of 1121586987 in words is "one billion, one hundred twenty-one million, five hundred eighty-six thousand, nine hundred eighty-seven".