139146121 has 2 divisors, whose sum is σ = 139146122. Its totient is φ = 139146120.

The previous prime is 139146109. The next prime is 139146143. The reversal of 139146121 is 121641931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71166096 + 67980025 = 8436^2 + 8245^2 .

It is a cyclic number.

It is not a de Polignac number, because 139146121 - 2⁹ = 139145609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139146121.

It is not a weakly prime, because it can be changed into another prime (139146191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69573060 + 69573061.

It is an arithmetic number, because the mean of its divisors is an integer number (69573061).

Almost surely, 2^139146121 is an apocalyptic number.

It is an amenable number.

139146121 is a deficient number, since it is larger than the sum of its proper divisors (1).

139146121 is an equidigital number, since it uses as much as digits as its factorization.

139146121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 139146121 is about 11796.0214055418. The cubic root of 139146121 is about 518.1915991429.

The spelling of 139146121 in words is "one hundred thirty-nine million, one hundred forty-six thousand, one hundred twenty-one".