43106209981 has 2 divisors, whose sum is σ = 43106209982. Its totient is φ = 43106209980.

The previous prime is 43106209973. The next prime is 43106209997. The reversal of 43106209981 is 18990260134.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34320897081 + 8785312900 = 185259^2 + 93730^2 .

It is a cyclic number.

It is not a de Polignac number, because 43106209981 - 2³ = 43106209973 is a prime.

It is a super-2 number, since 2×43106209981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43106209901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21553104990 + 21553104991.

It is an arithmetic number, because the mean of its divisors is an integer number (21553104991).

Almost surely, 2^43106209981 is an apocalyptic number.

It is an amenable number.

43106209981 is a deficient number, since it is larger than the sum of its proper divisors (1).

43106209981 is an equidigital number, since it uses as much as digits as its factorization.

43106209981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 43106209981 in words is "forty-three billion, one hundred six million, two hundred nine thousand, nine hundred eighty-one".