139321123 has 2 divisors, whose sum is σ = 139321124. Its totient is φ = 139321122.

The previous prime is 139321111. The next prime is 139321139. The reversal of 139321123 is 321123931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139321123 - 2¹³ = 139312931 is a prime.

It is a super-2 number, since 2×139321123² = 38820750627962258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139321163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69660561 + 69660562.

It is an arithmetic number, because the mean of its divisors is an integer number (69660562).

Almost surely, 2^139321123 is an apocalyptic number.

139321123 is a deficient number, since it is larger than the sum of its proper divisors (1).

139321123 is an equidigital number, since it uses as much as digits as its factorization.

139321123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 25.

The square root of 139321123 is about 11803.4369147295. The cubic root of 139321123 is about 518.4087487469.

The spelling of 139321123 in words is "one hundred thirty-nine million, three hundred twenty-one thousand, one hundred twenty-three".