101820443 has 2 divisors, whose sum is σ = 101820444. Its totient is φ = 101820442.

The previous prime is 101820427. The next prime is 101820469. The reversal of 101820443 is 344028101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101820443 - 2⁴ = 101820427 is a prime.

It is a super-2 number, since 2×101820443² = 20734805225432498, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (101820403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50910221 + 50910222.

It is an arithmetic number, because the mean of its divisors is an integer number (50910222).

Almost surely, 2^101820443 is an apocalyptic number.

101820443 is a deficient number, since it is larger than the sum of its proper divisors (1).

101820443 is an equidigital number, since it uses as much as digits as its factorization.

101820443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 101820443 is about 10090.6116266557. The cubic root of 101820443 is about 466.9585453530.

Adding to 101820443 its reverse (344028101), we get a palindrome (445848544).

The spelling of 101820443 in words is "one hundred one million, eight hundred twenty thousand, four hundred forty-three".