801981101 has 2 divisors, whose sum is σ = 801981102. Its totient is φ = 801981100.

The previous prime is 801981079. The next prime is 801981133. The reversal of 801981101 is 101189108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742290025 + 59691076 = 27245^2 + 7726^2 .

It is a cyclic number.

It is not a de Polignac number, because 801981101 - 2²² = 797786797 is a prime.

It is a super-2 number, since 2×801981101² = 1286347372722344402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (801981151) 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, 400990550 + 400990551.

It is an arithmetic number, because the mean of its divisors is an integer number (400990551).

Almost surely, 2^801981101 is an apocalyptic number.

It is an amenable number.

801981101 is a deficient number, since it is larger than the sum of its proper divisors (1).

801981101 is an equidigital number, since it uses as much as digits as its factorization.

801981101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 801981101 is about 28319.2708416018. The cubic root of 801981101 is about 929.0834230755.

The spelling of 801981101 in words is "eight hundred one million, nine hundred eighty-one thousand, one hundred one".