140542217 has 2 divisors, whose sum is σ = 140542218. Its totient is φ = 140542216.

The previous prime is 140542201. The next prime is 140542223. The reversal of 140542217 is 712245041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139334416 + 1207801 = 11804^2 + 1099^2 .

It is a cyclic number.

It is not a de Polignac number, because 140542217 - 2⁴ = 140542201 is a prime.

It is a super-2 number, since 2×140542217² = 39504229518550178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140542117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70271108 + 70271109.

It is an arithmetic number, because the mean of its divisors is an integer number (70271109).

Almost surely, 2^140542217 is an apocalyptic number.

It is an amenable number.

140542217 is a deficient number, since it is larger than the sum of its proper divisors (1).

140542217 is an equidigital number, since it uses as much as digits as its factorization.

140542217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 140542217 is about 11855.0502740393. The cubic root of 140542217 is about 519.9188939085.

Adding to 140542217 its reverse (712245041), we get a palindrome (852787258).

The spelling of 140542217 in words is "one hundred forty million, five hundred forty-two thousand, two hundred seventeen".