1155889979 has 2 divisors, whose sum is σ = 1155889980.
Its totient is φ = 1155889978.
The previous prime is 1155889967. The next prime is 1155890003. The reversal of 1155889979 is 9799885511.
It is a weak prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1155889979 is a prime.
It is a Sophie Germain prime.
It is not a weakly prime, because it can be changed into another prime (1155889919) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577944989 + 577944990.
It is an arithmetic number, because the mean of its divisors is an integer number (577944990).
Almost surely, 21155889979 is an apocalyptic number.
1155889979 is a deficient number, since it is larger than the sum of its proper divisors (1).
1155889979 is an equidigital number, since it uses as much as digits as its factorization.
1155889979 is an evil number, because the sum of its binary digits is even.
The product of its digits is 8164800, while the sum is 62.
The square root of 1155889979 is about 33998.3820056190.
The cubic root of 1155889979 is about 1049.4751659787.
The spelling of 1155889979 in words is "one billion, one hundred fifty-five million, eight hundred eighty-nine thousand, nine hundred seventy-nine".