1000863881 has 2 divisors, whose sum is σ = 1000863882. Its totient is φ = 1000863880.

The previous prime is 1000863869. The next prime is 1000863907. The reversal of 1000863881 is 1883680001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659205625 + 341658256 = 25675^2 + 18484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000863881 is a prime.

It is a super-2 number, since 2×1000863881² = 2003457016580764322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1000863811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500431940 + 500431941.

It is an arithmetic number, because the mean of its divisors is an integer number (500431941).

Almost surely, 2^1000863881 is an apocalyptic number.

It is an amenable number.

1000863881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000863881 is an equidigital number, since it uses as much as digits as its factorization.

1000863881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1000863881 is about 31636.4328109223. The cubic root of 1000863881 is about 1000.2878774520.

The spelling of 1000863881 in words is "one billion, eight hundred sixty-three thousand, eight hundred eighty-one".