43512661 has 2 divisors, whose sum is σ = 43512662. Its totient is φ = 43512660.

The previous prime is 43512653. The next prime is 43512697. The reversal of 43512661 is 16621534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41280625 + 2232036 = 6425^2 + 1494^2 .

It is a cyclic number.

It is not a de Polignac number, because 43512661 - 2³ = 43512653 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 (43512761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21756330 + 21756331.

It is an arithmetic number, because the mean of its divisors is an integer number (21756331).

Almost surely, 2^43512661 is an apocalyptic number.

It is an amenable number.

43512661 is a deficient number, since it is larger than the sum of its proper divisors (1).

43512661 is an equidigital number, since it uses as much as digits as its factorization.

43512661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 43512661 is about 6596.4127372383. The cubic root of 43512661 is about 351.7266003983.

The spelling of 43512661 in words is "forty-three million, five hundred twelve thousand, six hundred sixty-one".