42045161 has 2 divisors, whose sum is σ = 42045162. Its totient is φ = 42045160.

The previous prime is 42045151. The next prime is 42045181. The reversal of 42045161 is 16154024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34515625 + 7529536 = 5875^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 42045161 - 2¹⁸ = 41783017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42045121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21022580 + 21022581.

It is an arithmetic number, because the mean of its divisors is an integer number (21022581).

Almost surely, 2^42045161 is an apocalyptic number.

It is an amenable number.

42045161 is a deficient number, since it is larger than the sum of its proper divisors (1).

42045161 is an equidigital number, since it uses as much as digits as its factorization.

42045161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 42045161 is about 6484.2240090854. The cubic root of 42045161 is about 347.7272078281.

Adding to 42045161 its reverse (16154024), we get a palindrome (58199185).

The spelling of 42045161 in words is "forty-two million, forty-five thousand, one hundred sixty-one".