1155990977 has 2 divisors, whose sum is σ = 1155990978. Its totient is φ = 1155990976.

The previous prime is 1155990967. The next prime is 1155991009. The reversal of 1155990977 is 7790995511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 924220801 + 231770176 = 30401^2 + 15224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155990977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155990967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577995488 + 577995489.

It is an arithmetic number, because the mean of its divisors is an integer number (577995489).

Almost surely, 2^1155990977 is an apocalyptic number.

It is an amenable number.

1155990977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155990977 is an equidigital number, since it uses as much as digits as its factorization.

1155990977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 893025, while the sum is 53.

The square root of 1155990977 is about 33999.8673085646. The cubic root of 1155990977 is about 1049.5057316922.

The spelling of 1155990977 in words is "one billion, one hundred fifty-five million, nine hundred ninety thousand, nine hundred seventy-seven".