1165257881 has 2 divisors, whose sum is σ = 1165257882. Its totient is φ = 1165257880.

The previous prime is 1165257811. The next prime is 1165257889. The reversal of 1165257881 is 1887525611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1101177856 + 64080025 = 33184^2 + 8005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165257881 is a prime.

It is a super-2 number, since 2×1165257881² = 2715651858465220322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1165257889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582628940 + 582628941.

It is an arithmetic number, because the mean of its divisors is an integer number (582628941).

Almost surely, 2^1165257881 is an apocalyptic number.

It is an amenable number.

1165257881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165257881 is an equidigital number, since it uses as much as digits as its factorization.

1165257881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 44.

The square root of 1165257881 is about 34135.8738133360. The cubic root of 1165257881 is about 1052.3026957538.

The spelling of 1165257881 in words is "one billion, one hundred sixty-five million, two hundred fifty-seven thousand, eight hundred eighty-one".