139660471 has 2 divisors, whose sum is σ = 139660472. Its totient is φ = 139660470.

The previous prime is 139660463. The next prime is 139660489. The reversal of 139660471 is 174066931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139660471 - 2³ = 139660463 is a prime.

It is a super-3 number, since 3×139660471³ (a number of 25 digits) contains 333 as substring.

It is equal to p_7894036 and since 139660471 and 7894036 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139660471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139660441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69830235 + 69830236.

It is an arithmetic number, because the mean of its divisors is an integer number (69830236).

Almost surely, 2^139660471 is an apocalyptic number.

139660471 is a deficient number, since it is larger than the sum of its proper divisors (1).

139660471 is an equidigital number, since it uses as much as digits as its factorization.

139660471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 139660471 is about 11817.8031376394. The cubic root of 139660471 is about 518.8293079307.

The spelling of 139660471 in words is "one hundred thirty-nine million, six hundred sixty thousand, four hundred seventy-one".