149866217 has 2 divisors, whose sum is σ = 149866218. Its totient is φ = 149866216.

The previous prime is 149866207. The next prime is 149866219. The reversal of 149866217 is 712668941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141039376 + 8826841 = 11876^2 + 2971^2 .

It is a cyclic number.

It is not a de Polignac number, because 149866217 - 2⁴ = 149866201 is a prime.

Together with 149866219, 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 (149866219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74933108 + 74933109.

It is an arithmetic number, because the mean of its divisors is an integer number (74933109).

Almost surely, 2^149866217 is an apocalyptic number.

It is an amenable number.

149866217 is a deficient number, since it is larger than the sum of its proper divisors (1).

149866217 is an equidigital number, since it uses as much as digits as its factorization.

149866217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 149866217 is about 12241.9858274710. The cubic root of 149866217 is about 531.1712757718.

The spelling of 149866217 in words is "one hundred forty-nine million, eight hundred sixty-six thousand, two hundred seventeen".