1050809781 has 16 divisors (see below), whose sum is σ = 1608233600. Its totient is φ = 597837888.

The previous prime is 1050809779. The next prime is 1050809783. The reversal of 1050809781 is 1879080501.

It is an interprime number because it is at equal distance from previous prime (1050809779) and next prime (1050809783).

It is not a de Polignac number, because 1050809781 - 2¹ = 1050809779 is a prime.

It is a super-2 number, since 2×1050809781² = 2208402391690535922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1050809783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104446 + ... + 114063.

It is an arithmetic number, because the mean of its divisors is an integer number (100514600).

Almost surely, 2^1050809781 is an apocalyptic number.

It is an amenable number.

1050809781 is a deficient number, since it is larger than the sum of its proper divisors (557423819).

1050809781 is a wasteful number, since it uses less digits than its factorization.

1050809781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218748.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 1050809781 is about 32416.1962759359. The cubic root of 1050809781 is about 1016.6575780728.

The spelling of 1050809781 in words is "one billion, fifty million, eight hundred nine thousand, seven hundred eighty-one".