43057661 has 4 divisors (see below), whose sum is σ = 43576512. Its totient is φ = 42538812.

The previous prime is 43057657. The next prime is 43057673. The reversal of 43057661 is 16675034.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16675034 = 2 ⋅8337517.

It is a cyclic number.

It is not a de Polignac number, because 43057661 - 2² = 43057657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43057681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259301 + ... + 259466.

It is an arithmetic number, because the mean of its divisors is an integer number (10894128).

Almost surely, 2^43057661 is an apocalyptic number.

It is an amenable number.

43057661 is a deficient number, since it is larger than the sum of its proper divisors (518851).

43057661 is an equidigital number, since it uses as much as digits as its factorization.

43057661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518850.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 43057661 is about 6561.8336614090. The cubic root of 43057661 is about 350.4963325563.

The spelling of 43057661 in words is "forty-three million, fifty-seven thousand, six hundred sixty-one".