1081691803 has 2 divisors, whose sum is σ = 1081691804. Its totient is φ = 1081691802.

The previous prime is 1081691801. The next prime is 1081691839. The reversal of 1081691803 is 3081961801.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1081691803 - 2¹ = 1081691801 is a prime.

Together with 1081691801, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1081691801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540845901 + 540845902.

It is an arithmetic number, because the mean of its divisors is an integer number (540845902).

Almost surely, 2^1081691803 is an apocalyptic number.

1081691803 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081691803 is an equidigital number, since it uses as much as digits as its factorization.

1081691803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1081691803 is about 32889.0833408291. The cubic root of 1081691803 is about 1026.5210185925.

The spelling of 1081691803 in words is "one billion, eighty-one million, six hundred ninety-one thousand, eight hundred three".