1158887771 has 4 divisors (see below), whose sum is σ = 1180753632. Its totient is φ = 1137021912.

The previous prime is 1158887761. The next prime is 1158887791. The reversal of 1158887771 is 1777888511.

It is a happy number.

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 1158887771 - 2¹⁸ = 1158625627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 21865807 = 1158887771 / (1 + 1 + 5 + 8 + 8 + 8 + 7 + 7 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1158887731) 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, 10932851 + ... + 10932956.

It is an arithmetic number, because the mean of its divisors is an integer number (295188408).

Almost surely, 2^1158887771 is an apocalyptic number.

1158887771 is a deficient number, since it is larger than the sum of its proper divisors (21865861).

1158887771 is an equidigital number, since it uses as much as digits as its factorization.

1158887771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21865860.

The product of its digits is 878080, while the sum is 53.

The square root of 1158887771 is about 34042.4407321214. The cubic root of 1158887771 is about 1050.3816514353.

The spelling of 1158887771 in words is "one billion, one hundred fifty-eight million, eight hundred eighty-seven thousand, seven hundred seventy-one".