1155415979 has 2 divisors, whose sum is σ = 1155415980. Its totient is φ = 1155415978.

The previous prime is 1155415927. The next prime is 1155415981. The reversal of 1155415979 is 9795145511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155415979 is a prime.

Together with 1155415981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1155415279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577707989 + 577707990.

It is an arithmetic number, because the mean of its divisors is an integer number (577707990).

Almost surely, 2^1155415979 is an apocalyptic number.

1155415979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155415979 is an equidigital number, since it uses as much as digits as its factorization.

1155415979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 283500, while the sum is 47.

The square root of 1155415979 is about 33991.4103708569. The cubic root of 1155415979 is about 1049.3316923349.

The spelling of 1155415979 in words is "one billion, one hundred fifty-five million, four hundred fifteen thousand, nine hundred seventy-nine".