139721107 has 2 divisors, whose sum is σ = 139721108. Its totient is φ = 139721106.

The previous prime is 139721089. The next prime is 139721111. The reversal of 139721107 is 701127931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139721107 - 2⁷ = 139720979 is a prime.

It is not a weakly prime, because it can be changed into another prime (139721137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69860553 + 69860554.

It is an arithmetic number, because the mean of its divisors is an integer number (69860554).

Almost surely, 2^139721107 is an apocalyptic number.

139721107 is a deficient number, since it is larger than the sum of its proper divisors (1).

139721107 is an equidigital number, since it uses as much as digits as its factorization.

139721107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 31.

The square root of 139721107 is about 11820.3683106746. The cubic root of 139721107 is about 518.9043832947.

The spelling of 139721107 in words is "one hundred thirty-nine million, seven hundred twenty-one thousand, one hundred seven".