43645057 has 2 divisors, whose sum is σ = 43645058. Its totient is φ = 43645056.

The previous prime is 43645037. The next prime is 43645079. The reversal of 43645057 is 75054634.

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., 38056561 + 5588496 = 6169^2 + 2364^2 .

It is a cyclic number.

It is not a de Polignac number, because 43645057 - 2⁷ = 43644929 is a prime.

It is not a weakly prime, because it can be changed into another prime (43645037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21822528 + 21822529.

It is an arithmetic number, because the mean of its divisors is an integer number (21822529).

Almost surely, 2^43645057 is an apocalyptic number.

It is an amenable number.

43645057 is a deficient number, since it is larger than the sum of its proper divisors (1).

43645057 is an equidigital number, since it uses as much as digits as its factorization.

43645057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 34.

The square root of 43645057 is about 6606.4405696260. The cubic root of 43645057 is about 352.0829721116.

The spelling of 43645057 in words is "forty-three million, six hundred forty-five thousand, fifty-seven".