40557161 has 4 divisors (see below), whose sum is σ = 40569924. Its totient is φ = 40544400.

The previous prime is 40557157. The next prime is 40557163. The reversal of 40557161 is 16175504.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7425625 + 33131536 = 2725^2 + 5756^2 .

It is a cyclic number.

It is not a de Polignac number, because 40557161 - 2² = 40557157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40557163) 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, 2591 + ... + 9371.

It is an arithmetic number, because the mean of its divisors is an integer number (10142481).

Almost surely, 2^40557161 is an apocalyptic number.

It is an amenable number.

40557161 is a deficient number, since it is larger than the sum of its proper divisors (12763).

40557161 is an equidigital number, since it uses as much as digits as its factorization.

40557161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12762.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 40557161 is about 6368.4504394711. The cubic root of 40557161 is about 343.5757598061.

The spelling of 40557161 in words is "forty million, five hundred fifty-seven thousand, one hundred sixty-one".