1000837861 has 2 divisors, whose sum is σ = 1000837862. Its totient is φ = 1000837860.

The previous prime is 1000837853. The next prime is 1000837909. The reversal of 1000837861 is 1687380001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 795804100 + 205033761 = 28210^2 + 14319^2 .

It is an emirp because it is prime and its reverse (1687380001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000837861 - 2³ = 1000837853 is a prime.

It is a super-2 number, since 2×1000837861² = 2003352848022110642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000837261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500418930 + 500418931.

It is an arithmetic number, because the mean of its divisors is an integer number (500418931).

Almost surely, 2^1000837861 is an apocalyptic number.

It is an amenable number.

1000837861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000837861 is an equidigital number, since it uses as much as digits as its factorization.

1000837861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 1000837861 is about 31636.0215735165. The cubic root of 1000837861 is about 1000.2792090351.

The spelling of 1000837861 in words is "one billion, eight hundred thirty-seven thousand, eight hundred sixty-one".