139348921 has 2 divisors, whose sum is σ = 139348922. Its totient is φ = 139348920.

The previous prime is 139348901. The next prime is 139348967. The reversal of 139348921 is 129843931.

139348921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124992400 + 14356521 = 11180^2 + 3789^2 .

It is a cyclic number.

It is not a de Polignac number, because 139348921 - 2¹¹ = 139346873 is a prime.

It is not a weakly prime, because it can be changed into another prime (139348901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69674460 + 69674461.

It is an arithmetic number, because the mean of its divisors is an integer number (69674461).

Almost surely, 2^139348921 is an apocalyptic number.

It is an amenable number.

139348921 is a deficient number, since it is larger than the sum of its proper divisors (1).

139348921 is an equidigital number, since it uses as much as digits as its factorization.

139348921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 139348921 is about 11804.6143943799. The cubic root of 139348921 is about 518.4432248976.

The spelling of 139348921 in words is "one hundred thirty-nine million, three hundred forty-eight thousand, nine hundred twenty-one".