140857217 has 2 divisors, whose sum is σ = 140857218. Its totient is φ = 140857216.

The previous prime is 140857183. The next prime is 140857219. The reversal of 140857217 is 712758041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124567921 + 16289296 = 11161^2 + 4036^2 .

It is a cyclic number.

It is not a de Polignac number, because 140857217 - 2⁶ = 140857153 is a prime.

It is a super-3 number, since 3×140857217³ (a number of 25 digits) contains 333 as substring.

Together with 140857219, 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 (140857219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70428608 + 70428609.

It is an arithmetic number, because the mean of its divisors is an integer number (70428609).

Almost surely, 2^140857217 is an apocalyptic number.

It is an amenable number.

140857217 is a deficient number, since it is larger than the sum of its proper divisors (1).

140857217 is an equidigital number, since it uses as much as digits as its factorization.

140857217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 140857217 is about 11868.3283153105. The cubic root of 140857217 is about 520.3070388380.

The spelling of 140857217 in words is "one hundred forty million, eight hundred fifty-seven thousand, two hundred seventeen".