1147861187 has 4 divisors (see below), whose sum is σ = 1252212216. Its totient is φ = 1043510160.

The previous prime is 1147861163. The next prime is 1147861201. The reversal of 1147861187 is 7811687411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7811687411 = 11 ⋅710153401.

It is a de Polignac number, because none of the positive numbers 2^k-1147861187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1147861157) 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, 52175498 + ... + 52175519.

It is an arithmetic number, because the mean of its divisors is an integer number (313053054).

Almost surely, 2^1147861187 is an apocalyptic number.

1147861187 is a deficient number, since it is larger than the sum of its proper divisors (104351029).

1147861187 is a wasteful number, since it uses less digits than its factorization.

1147861187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104351028.

The product of its digits is 75264, while the sum is 44.

The square root of 1147861187 is about 33880.1001621896. The cubic root of 1147861187 is about 1047.0396393585.

The spelling of 1147861187 in words is "one billion, one hundred forty-seven million, eight hundred sixty-one thousand, one hundred eighty-seven".