217150139 has 2 divisors, whose sum is σ = 217150140. Its totient is φ = 217150138.

The previous prime is 217150111. The next prime is 217150147. The reversal of 217150139 is 931051712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217150139 is a prime.

It is not a weakly prime, because it can be changed into another prime (217150189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108575069 + 108575070.

It is an arithmetic number, because the mean of its divisors is an integer number (108575070).

Almost surely, 2^217150139 is an apocalyptic number.

217150139 is a deficient number, since it is larger than the sum of its proper divisors (1).

217150139 is an equidigital number, since it uses as much as digits as its factorization.

217150139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 217150139 is about 14736.0150312084. The cubic root of 217150139 is about 601.0630589157.

The spelling of 217150139 in words is "two hundred seventeen million, one hundred fifty thousand, one hundred thirty-nine".