802636981 has 2 divisors, whose sum is σ = 802636982. Its totient is φ = 802636980.

The previous prime is 802636979. The next prime is 802637021. The reversal of 802636981 is 189636208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 473758756 + 328878225 = 21766^2 + 18135^2 .

It is a cyclic number.

It is not a de Polignac number, because 802636981 - 2¹ = 802636979 is a prime.

It is a super-2 number, since 2×802636981² = 1288452246537588722, which contains 22 as substring.

Together with 802636979, 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 (802636381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401318490 + 401318491.

It is an arithmetic number, because the mean of its divisors is an integer number (401318491).

Almost surely, 2^802636981 is an apocalyptic number.

It is an amenable number.

802636981 is a deficient number, since it is larger than the sum of its proper divisors (1).

802636981 is an equidigital number, since it uses as much as digits as its factorization.

802636981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 802636981 is about 28330.8485753604. The cubic root of 802636981 is about 929.3366298704.

The spelling of 802636981 in words is "eight hundred two million, six hundred thirty-six thousand, nine hundred eighty-one".