139399951 has 2 divisors, whose sum is σ = 139399952. Its totient is φ = 139399950.

The previous prime is 139399933. The next prime is 139399957. The reversal of 139399951 is 159993931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139399951 - 2¹¹ = 139397903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139399895 and 139399904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139399957) 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, 69699975 + 69699976.

It is an arithmetic number, because the mean of its divisors is an integer number (69699976).

Almost surely, 2^139399951 is an apocalyptic number.

139399951 is a deficient number, since it is larger than the sum of its proper divisors (1).

139399951 is an equidigital number, since it uses as much as digits as its factorization.

139399951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 295245, while the sum is 49.

The square root of 139399951 is about 11806.7756394369. The cubic root of 139399951 is about 518.5065023376.

The spelling of 139399951 in words is "one hundred thirty-nine million, three hundred ninety-nine thousand, nine hundred fifty-one".