1135821987 has 8 divisors (see below), whose sum is σ = 1682699280. Its totient is φ = 757214640.

The previous prime is 1135821961. The next prime is 1135821991. The reversal of 1135821987 is 7891285311.

1135821987 is a `hidden beast` number, since 1 + 1 + 358 + 219 + 87 = 666.

It is not a de Polignac number, because 1135821987 - 2⁶ = 1135821923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1135821887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21033714 + ... + 21033767.

It is an arithmetic number, because the mean of its divisors is an integer number (210337410).

Almost surely, 2^1135821987 is an apocalyptic number.

1135821987 is a deficient number, since it is larger than the sum of its proper divisors (546877293).

1135821987 is an equidigital number, since it uses as much as digits as its factorization.

1135821987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42067490 (or 42067484 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 1135821987 is about 33701.9582072021. The cubic root of 1135821987 is about 1043.3661845164.

The spelling of 1135821987 in words is "one billion, one hundred thirty-five million, eight hundred twenty-one thousand, nine hundred eighty-seven".