139021123 has 2 divisors, whose sum is σ = 139021124. Its totient is φ = 139021122.

The previous prime is 139021111. The next prime is 139021139. The reversal of 139021123 is 321120931.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139021123 is a prime.

It is a super-2 number, since 2×139021123² = 38653745280362258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139021094 and 139021103.

It is not a weakly prime, because it can be changed into another prime (139021153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69510561 + 69510562.

It is an arithmetic number, because the mean of its divisors is an integer number (69510562).

Almost surely, 2^139021123 is an apocalyptic number.

139021123 is a deficient number, since it is larger than the sum of its proper divisors (1).

139021123 is an equidigital number, since it uses as much as digits as its factorization.

139021123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 139021123 is about 11790.7219032594. The cubic root of 139021123 is about 518.0363850453.

The spelling of 139021123 in words is "one hundred thirty-nine million, twenty-one thousand, one hundred twenty-three".