1151981779 has 8 divisors (see below), whose sum is σ = 1243926992. Its totient is φ = 1060512480.

The previous prime is 1151981773. The next prime is 1151981813. The reversal of 1151981779 is 9771891511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1151981779 - 2²¹ = 1149884627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151981773) 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, 113937 + ... + 123634.

It is an arithmetic number, because the mean of its divisors is an integer number (155490874).

Almost surely, 2^1151981779 is an apocalyptic number.

1151981779 is a deficient number, since it is larger than the sum of its proper divisors (91945213).

1151981779 is a wasteful number, since it uses less digits than its factorization.

1151981779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237957.

The product of its digits is 158760, while the sum is 49.

The square root of 1151981779 is about 33940.8570752125. The cubic root of 1151981779 is about 1048.2910307413.

The spelling of 1151981779 in words is "one billion, one hundred fifty-one million, nine hundred eighty-one thousand, seven hundred seventy-nine".