43121301111989 has 2 divisors, whose sum is σ = 43121301111990. Its totient is φ = 43121301111988.

The previous prime is 43121301111983. The next prime is 43121301112013. The reversal of 43121301111989 is 98911110312134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42126460440100 + 994840671889 = 6490490^2 + 997417^2 .

It is a cyclic number.

It is not a de Polignac number, because 43121301111989 - 2¹² = 43121301107893 is a prime.

It is a super-2 number, since 2×43121301111989² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43121301111983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21560650555994 + 21560650555995.

It is an arithmetic number, because the mean of its divisors is an integer number (21560650555995).

Almost surely, 2^{43121301111989} is an apocalyptic number.

It is an amenable number.

43121301111989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43121301111989 is an equidigital number, since it uses as much as digits as its factorization.

43121301111989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 44.

The spelling of 43121301111989 in words is "forty-three trillion, one hundred twenty-one billion, three hundred one million, one hundred eleven thousand, nine hundred eighty-nine".