42501161 has 2 divisors, whose sum is σ = 42501162. Its totient is φ = 42501160.

The previous prime is 42501091. The next prime is 42501163. The reversal of 42501161 is 16110524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33235225 + 9265936 = 5765^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 42501161 - 2¹⁰ = 42500137 is a prime.

Together with 42501163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42501163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21250580 + 21250581.

It is an arithmetic number, because the mean of its divisors is an integer number (21250581).

Almost surely, 2^42501161 is an apocalyptic number.

It is an amenable number.

42501161 is a deficient number, since it is larger than the sum of its proper divisors (1).

42501161 is an equidigital number, since it uses as much as digits as its factorization.

42501161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 42501161 is about 6519.2914492297. The cubic root of 42501161 is about 348.9797800564.

Adding to 42501161 its reverse (16110524), we get a palindrome (58611685).

The spelling of 42501161 in words is "forty-two million, five hundred one thousand, one hundred sixty-one".