139217669 has 2 divisors, whose sum is σ = 139217670. Its totient is φ = 139217668.

The previous prime is 139217657. The next prime is 139217681. The reversal of 139217669 is 966712931.

It is a balanced prime because it is at equal distance from previous prime (139217657) and next prime (139217681).

It can be written as a sum of positive squares in only one way, i.e., 81685444 + 57532225 = 9038^2 + 7585^2 .

It is a cyclic number.

It is not a de Polignac number, because 139217669 - 2⁴ = 139217653 is a prime.

It is a super-2 number, since 2×139217669² = 38763118723587122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139217609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69608834 + 69608835.

It is an arithmetic number, because the mean of its divisors is an integer number (69608835).

Almost surely, 2^139217669 is an apocalyptic number.

It is an amenable number.

139217669 is a deficient number, since it is larger than the sum of its proper divisors (1).

139217669 is an equidigital number, since it uses as much as digits as its factorization.

139217669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 139217669 is about 11799.0537332449. The cubic root of 139217669 is about 518.2804008031.

The spelling of 139217669 in words is "one hundred thirty-nine million, two hundred seventeen thousand, six hundred sixty-nine".