40142161 has 2 divisors, whose sum is σ = 40142162. Its totient is φ = 40142160.

The previous prime is 40142159. The next prime is 40142171. The reversal of 40142161 is 16124104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35034561 + 5107600 = 5919^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 40142161 - 2¹ = 40142159 is a prime.

It is a super-2 number, since 2×40142161² = 3222786179499842, which contains 22 as substring.

Together with 40142159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40142171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20071080 + 20071081.

It is an arithmetic number, because the mean of its divisors is an integer number (20071081).

Almost surely, 2^40142161 is an apocalyptic number.

It is an amenable number.

40142161 is a deficient number, since it is larger than the sum of its proper divisors (1).

40142161 is an equidigital number, since it uses as much as digits as its factorization.

40142161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 40142161 is about 6335.7841661471. The cubic root of 40142161 is about 342.3998634569.

Adding to 40142161 its reverse (16124104), we get a palindrome (56266265).

The spelling of 40142161 in words is "forty million, one hundred forty-two thousand, one hundred sixty-one".