43607621 has 2 divisors, whose sum is σ = 43607622. Its totient is φ = 43607620.

The previous prime is 43607593. The next prime is 43607647. The reversal of 43607621 is 12670634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43230625 + 376996 = 6575^2 + 614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43607621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43604621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21803810 + 21803811.

It is an arithmetic number, because the mean of its divisors is an integer number (21803811).

Almost surely, 2^43607621 is an apocalyptic number.

It is an amenable number.

43607621 is a deficient number, since it is larger than the sum of its proper divisors (1).

43607621 is an equidigital number, since it uses as much as digits as its factorization.

43607621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 43607621 is about 6603.6066660576. The cubic root of 43607621 is about 351.9822783993.

The spelling of 43607621 in words is "forty-three million, six hundred seven thousand, six hundred twenty-one".