43361639 has 2 divisors, whose sum is σ = 43361640. Its totient is φ = 43361638.

The previous prime is 43361609. The next prime is 43361651. The reversal of 43361639 is 93616334.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43361639 - 2¹² = 43357543 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 43361599 and 43361608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43361609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21680819 + 21680820.

It is an arithmetic number, because the mean of its divisors is an integer number (21680820).

Almost surely, 2^43361639 is an apocalyptic number.

43361639 is a deficient number, since it is larger than the sum of its proper divisors (1).

43361639 is an equidigital number, since it uses as much as digits as its factorization.

43361639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 35.

The square root of 43361639 is about 6584.9555047851. The cubic root of 43361639 is about 351.3192091854.

The spelling of 43361639 in words is "forty-three million, three hundred sixty-one thousand, six hundred thirty-nine".