43121381077 has 2 divisors, whose sum is σ = 43121381078. Its totient is φ = 43121381076.

The previous prime is 43121381029. The next prime is 43121381117. The reversal of 43121381077 is 77018312134.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41371966801 + 1749414276 = 203401^2 + 41826^2 .

It is a cyclic number.

It is not a de Polignac number, because 43121381077 - 2³⁵ = 8761642709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43121381477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21560690538 + 21560690539.

It is an arithmetic number, because the mean of its divisors is an integer number (21560690539).

Almost surely, 2^43121381077 is an apocalyptic number.

It is an amenable number.

43121381077 is a deficient number, since it is larger than the sum of its proper divisors (1).

43121381077 is an equidigital number, since it uses as much as digits as its factorization.

43121381077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 43121381077 in words is "forty-three billion, one hundred twenty-one million, three hundred eighty-one thousand, seventy-seven".