139203391 has 2 divisors, whose sum is σ = 139203392. Its totient is φ = 139203390.

The previous prime is 139203377. The next prime is 139203397. The reversal of 139203391 is 193302931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139203391 - 2⁵ = 139203359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139203397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69601695 + 69601696.

It is an arithmetic number, because the mean of its divisors is an integer number (69601696).

Almost surely, 2^139203391 is an apocalyptic number.

139203391 is a deficient number, since it is larger than the sum of its proper divisors (1).

139203391 is an equidigital number, since it uses as much as digits as its factorization.

139203391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 139203391 is about 11798.4486692107. The cubic root of 139203391 is about 518.2626821218.

The spelling of 139203391 in words is "one hundred thirty-nine million, two hundred three thousand, three hundred ninety-one".