1081691801 has 2 divisors, whose sum is σ = 1081691802. Its totient is φ = 1081691800.

The previous prime is 1081691791. The next prime is 1081691803. The reversal of 1081691801 is 1081961801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1074266176 + 7425625 = 32776^2 + 2725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081691801 is a prime.

Together with 1081691803, it forms a pair of twin primes.

It is a Chen prime.

1081691801 is a strobogrammatic number because it is the same when read upside-down.

It is not a weakly prime, because it can be changed into another prime (1081691803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540845900 + 540845901.

It is an arithmetic number, because the mean of its divisors is an integer number (540845901).

Almost surely, 2^1081691801 is an apocalyptic number.

It is an amenable number.

1081691801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081691801 is an equidigital number, since it uses as much as digits as its factorization.

1081691801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 35.

The square root of 1081691801 is about 32889.0833104238. The cubic root of 1081691801 is about 1026.5210179598.

The spelling of 1081691801 in words is "one billion, eighty-one million, six hundred ninety-one thousand, eight hundred one".