1081037781 has 12 divisors (see below), whose sum is σ = 1568320780. Its totient is φ = 717543360.

The previous prime is 1081037777. The next prime is 1081037809. The reversal of 1081037781 is 1877301801.

It can be written as a sum of positive squares in 2 ways, for example, as 716418756 + 364619025 = 26766^2 + 19095^2 .

It is not a de Polignac number, because 1081037781 - 2² = 1081037777 is a prime.

It is a super-2 number, since 2×1081037781² = 2337285367898807922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081037761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260200 + ... + 264321.

Almost surely, 2^1081037781 is an apocalyptic number.

It is an amenable number.

1081037781 is a deficient number, since it is larger than the sum of its proper divisors (487282999).

1081037781 is a wasteful number, since it uses less digits than its factorization.

1081037781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524756 (or 524753 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 36.

The square root of 1081037781 is about 32879.1389942012. The cubic root of 1081037781 is about 1026.3140888297.

The spelling of 1081037781 in words is "one billion, eighty-one million, thirty-seven thousand, seven hundred eighty-one".