43145257 has 4 divisors (see below), whose sum is σ = 45416080. Its totient is φ = 40874436.

The previous prime is 43145251. The next prime is 43145261. The reversal of 43145257 is 75254134.

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.

It is a cyclic number.

It is not a de Polignac number, because 43145257 - 2²³ = 34756649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43145251) 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, 1135383 + ... + 1135420.

It is an arithmetic number, because the mean of its divisors is an integer number (11354020).

Almost surely, 2^43145257 is an apocalyptic number.

It is an amenable number.

43145257 is a deficient number, since it is larger than the sum of its proper divisors (2270823).

43145257 is a wasteful number, since it uses less digits than its factorization.

43145257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270822.

The product of its digits is 16800, while the sum is 31.

The square root of 43145257 is about 6568.5049288251. The cubic root of 43145257 is about 350.7338534337.

The spelling of 43145257 in words is "forty-three million, one hundred forty-five thousand, two hundred fifty-seven".