142236169 has 2 divisors, whose sum is σ = 142236170. Its totient is φ = 142236168.

The previous prime is 142236137. The next prime is 142236173. The reversal of 142236169 is 961632241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142086400 + 149769 = 11920^2 + 387^2 .

It is a cyclic number.

It is not a de Polignac number, because 142236169 - 2⁵ = 142236137 is a prime.

It is a super-2 number, since 2×142236169² = 40462255543593122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142236119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71118084 + 71118085.

It is an arithmetic number, because the mean of its divisors is an integer number (71118085).

Almost surely, 2^142236169 is an apocalyptic number.

It is an amenable number.

142236169 is a deficient number, since it is larger than the sum of its proper divisors (1).

142236169 is an equidigital number, since it uses as much as digits as its factorization.

142236169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 142236169 is about 11926.2806020989. The cubic root of 142236169 is about 521.9994140322. Note that the first 3 decimals are identical.

The spelling of 142236169 in words is "one hundred forty-two million, two hundred thirty-six thousand, one hundred sixty-nine".