801388981 has 2 divisors, whose sum is σ = 801388982. Its totient is φ = 801388980.

The previous prime is 801388961. The next prime is 801389003. The reversal of 801388981 is 189883108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 783496081 + 17892900 = 27991^2 + 4230^2 .

It is a cyclic number.

It is not a de Polignac number, because 801388981 - 2⁵ = 801388949 is a prime.

It is a super-2 number, since 2×801388981² = 1284448597736436722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (801388961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400694490 + 400694491.

It is an arithmetic number, because the mean of its divisors is an integer number (400694491).

Almost surely, 2^801388981 is an apocalyptic number.

It is an amenable number.

801388981 is a deficient number, since it is larger than the sum of its proper divisors (1).

801388981 is an equidigital number, since it uses as much as digits as its factorization.

801388981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 46.

The square root of 801388981 is about 28308.8145460032. The cubic root of 801388981 is about 928.8547126475.

The spelling of 801388981 in words is "eight hundred one million, three hundred eighty-eight thousand, nine hundred eighty-one".