43720242817 has 2 divisors, whose sum is σ = 43720242818. Its totient is φ = 43720242816.

The previous prime is 43720242781. The next prime is 43720242821. The reversal of 43720242817 is 71824202734.

Together with previous prime (43720242781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40434775056 + 3285467761 = 201084^2 + 57319^2 .

It is a cyclic number.

It is not a de Polignac number, because 43720242817 - 2⁷ = 43720242689 is a prime.

It is a super-2 number, since 2×43720242817² (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 43720242817.

It is not a weakly prime, because it can be changed into another prime (43720242827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21860121408 + 21860121409.

It is an arithmetic number, because the mean of its divisors is an integer number (21860121409).

Almost surely, 2^43720242817 is an apocalyptic number.

It is an amenable number.

43720242817 is a deficient number, since it is larger than the sum of its proper divisors (1).

43720242817 is an equidigital number, since it uses as much as digits as its factorization.

43720242817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 40.

The spelling of 43720242817 in words is "forty-three billion, seven hundred twenty million, two hundred forty-two thousand, eight hundred seventeen".