43120661 has 2 divisors, whose sum is σ = 43120662. Its totient is φ = 43120660.

The previous prime is 43120657. The next prime is 43120669. The reversal of 43120661 is 16602134.

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., 38254225 + 4866436 = 6185^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 43120661 - 2² = 43120657 is a prime.

It is a super-3 number, since 3×43120661³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43120669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21560330 + 21560331.

It is an arithmetic number, because the mean of its divisors is an integer number (21560331).

Almost surely, 2^43120661 is an apocalyptic number.

It is an amenable number.

43120661 is a deficient number, since it is larger than the sum of its proper divisors (1).

43120661 is an equidigital number, since it uses as much as digits as its factorization.

43120661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 43120661 is about 6566.6323941576. The cubic root of 43120661 is about 350.6671926521.

Adding to 43120661 its reverse (16602134), we get a palindrome (59722795).

The spelling of 43120661 in words is "forty-three million, one hundred twenty thousand, six hundred sixty-one".