139654217 has 2 divisors, whose sum is σ = 139654218. Its totient is φ = 139654216.

The previous prime is 139654211. The next prime is 139654247. The reversal of 139654217 is 712456931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119006281 + 20647936 = 10909^2 + 4544^2 .

It is a cyclic number.

It is not a de Polignac number, because 139654217 - 2¹⁴ = 139637833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139654211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69827108 + 69827109.

It is an arithmetic number, because the mean of its divisors is an integer number (69827109).

Almost surely, 2^139654217 is an apocalyptic number.

It is an amenable number.

139654217 is a deficient number, since it is larger than the sum of its proper divisors (1).

139654217 is an equidigital number, since it uses as much as digits as its factorization.

139654217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 139654217 is about 11817.5385338911. The cubic root of 139654217 is about 518.8215634179.

The spelling of 139654217 in words is "one hundred thirty-nine million, six hundred fifty-four thousand, two hundred seventeen".