139391311 has 2 divisors, whose sum is σ = 139391312. Its totient is φ = 139391310.

The previous prime is 139391309. The next prime is 139391323. The reversal of 139391311 is 113193931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139391311 - 2¹ = 139391309 is a prime.

Together with 139391309, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139391111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69695655 + 69695656.

It is an arithmetic number, because the mean of its divisors is an integer number (69695656).

Almost surely, 2^139391311 is an apocalyptic number.

139391311 is a deficient number, since it is larger than the sum of its proper divisors (1).

139391311 is an equidigital number, since it uses as much as digits as its factorization.

139391311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 31.

The square root of 139391311 is about 11806.4097421697. The cubic root of 139391311 is about 518.4957897831.

The spelling of 139391311 in words is "one hundred thirty-nine million, three hundred ninety-one thousand, three hundred eleven".