142166081 has 2 divisors, whose sum is σ = 142166082. Its totient is φ = 142166080.

The previous prime is 142166071. The next prime is 142166107. The reversal of 142166081 is 180661241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88642225 + 53523856 = 9415^2 + 7316^2 .

It is an emirp because it is prime and its reverse (180661241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142166081 - 2¹⁰ = 142165057 is a prime.

It is a super-2 number, since 2×142166081² = 40422389173797122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142166071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71083040 + 71083041.

It is an arithmetic number, because the mean of its divisors is an integer number (71083041).

Almost surely, 2^142166081 is an apocalyptic number.

It is an amenable number.

142166081 is a deficient number, since it is larger than the sum of its proper divisors (1).

142166081 is an equidigital number, since it uses as much as digits as its factorization.

142166081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 142166081 is about 11923.3418553692. The cubic root of 142166081 is about 521.9136601621.

The spelling of 142166081 in words is "one hundred forty-two million, one hundred sixty-six thousand, eighty-one".