101440081 has 2 divisors, whose sum is σ = 101440082. Its totient is φ = 101440080.

The previous prime is 101440067. The next prime is 101440093. The reversal of 101440081 is 180044101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54982225 + 46457856 = 7415^2 + 6816^2 .

It is an emirp because it is prime and its reverse (180044101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101440081 - 2⁵ = 101440049 is a prime.

It is a super-2 number, since 2×101440081² = 20580180066573122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (101440021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50720040 + 50720041.

It is an arithmetic number, because the mean of its divisors is an integer number (50720041).

Almost surely, 2^101440081 is an apocalyptic number.

It is an amenable number.

101440081 is a deficient number, since it is larger than the sum of its proper divisors (1).

101440081 is an equidigital number, since it uses as much as digits as its factorization.

101440081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 101440081 is about 10071.7466707617. The cubic root of 101440081 is about 466.3763606558.

Adding to 101440081 its reverse (180044101), we get a palindrome (281484182).

The spelling of 101440081 in words is "one hundred one million, four hundred forty thousand, eighty-one".