1168901681 has 2 divisors, whose sum is σ = 1168901682. Its totient is φ = 1168901680.

The previous prime is 1168901633. The next prime is 1168901693. The reversal of 1168901681 is 1861098611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 974438656 + 194463025 = 31216^2 + 13945^2 .

It is an emirp because it is prime and its reverse (1861098611) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1891068911 and 1198601981.

It is a cyclic number.

It is not a de Polignac number, because 1168901681 - 2²⁶ = 1101792817 is a prime.

It is a super-2 number, since 2×1168901681² = 2732662279689251522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1168901611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 584450840 + 584450841.

It is an arithmetic number, because the mean of its divisors is an integer number (584450841).

Almost surely, 2^1168901681 is an apocalyptic number.

It is an amenable number.

1168901681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1168901681 is an equidigital number, since it uses as much as digits as its factorization.

1168901681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 1168901681 is about 34189.2041586229. The cubic root of 1168901681 is about 1053.3984162260.

The spelling of 1168901681 in words is "one billion, one hundred sixty-eight million, nine hundred one thousand, six hundred eighty-one".