1165987513 has 2 divisors, whose sum is σ = 1165987514. Its totient is φ = 1165987512.

The previous prime is 1165987499. The next prime is 1165987519. The reversal of 1165987513 is 3157895611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 723179664 + 442807849 = 26892^2 + 21043^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165987513 - 2²¹ = 1163890361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1165987519) 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, 582993756 + 582993757.

It is an arithmetic number, because the mean of its divisors is an integer number (582993757).

Almost surely, 2^1165987513 is an apocalyptic number.

It is an amenable number.

1165987513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165987513 is an equidigital number, since it uses as much as digits as its factorization.

1165987513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 46.

The square root of 1165987513 is about 34146.5593142267. The cubic root of 1165987513 is about 1052.5222847782.

The spelling of 1165987513 in words is "one billion, one hundred sixty-five million, nine hundred eighty-seven thousand, five hundred thirteen".