43398775481 has 2 divisors, whose sum is σ = 43398775482. Its totient is φ = 43398775480.

The previous prime is 43398775451. The next prime is 43398775549. The reversal of 43398775481 is 18457789334.

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., 34728186025 + 8670589456 = 186355^2 + 93116^2 .

It is a cyclic number.

It is not a de Polignac number, because 43398775481 - 2²² = 43394581177 is a prime.

It is a super-2 number, since 2×43398775481² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43398775481.

It is not a weakly prime, because it can be changed into another prime (43398775411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21699387740 + 21699387741.

It is an arithmetic number, because the mean of its divisors is an integer number (21699387741).

Almost surely, 2^43398775481 is an apocalyptic number.

It is an amenable number.

43398775481 is a deficient number, since it is larger than the sum of its proper divisors (1).

43398775481 is an equidigital number, since it uses as much as digits as its factorization.

43398775481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 59.

The spelling of 43398775481 in words is "forty-three billion, three hundred ninety-eight million, seven hundred seventy-five thousand, four hundred eighty-one".