139655771 has 2 divisors, whose sum is σ = 139655772. Its totient is φ = 139655770.

The previous prime is 139655759. The next prime is 139655777. The reversal of 139655771 is 177556931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139655771 - 2⁶ = 139655707 is a prime.

It is not a weakly prime, because it can be changed into another prime (139655777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69827885 + 69827886.

It is an arithmetic number, because the mean of its divisors is an integer number (69827886).

Almost surely, 2^139655771 is an apocalyptic number.

139655771 is a deficient number, since it is larger than the sum of its proper divisors (1).

139655771 is an equidigital number, since it uses as much as digits as its factorization.

139655771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 198450, while the sum is 44.

The square root of 139655771 is about 11817.6042834409. The cubic root of 139655771 is about 518.8234878035.

The spelling of 139655771 in words is "one hundred thirty-nine million, six hundred fifty-five thousand, seven hundred seventy-one".