1049811781 has 2 divisors, whose sum is σ = 1049811782. Its totient is φ = 1049811780.

The previous prime is 1049811779. The next prime is 1049811901. The reversal of 1049811781 is 1871189401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 769785025 + 280026756 = 27745^2 + 16734^2 .

It is a cyclic number.

It is not a de Polignac number, because 1049811781 - 2¹ = 1049811779 is a prime.

It is a super-2 number, since 2×1049811781² = 2204209551052783922, which contains 22 as substring.

Together with 1049811779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1049811481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 524905890 + 524905891.

It is an arithmetic number, because the mean of its divisors is an integer number (524905891).

Almost surely, 2^1049811781 is an apocalyptic number.

It is an amenable number.

1049811781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1049811781 is an equidigital number, since it uses as much as digits as its factorization.

1049811781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 40.

The square root of 1049811781 is about 32400.7990796523. The cubic root of 1049811781 is about 1016.3356214060.

The spelling of 1049811781 in words is "one billion, forty-nine million, eight hundred eleven thousand, seven hundred eighty-one".