139591447 has 2 divisors, whose sum is σ = 139591448. Its totient is φ = 139591446.

The previous prime is 139591421. The next prime is 139591477. The reversal of 139591447 is 744195931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139591447 - 2¹¹ = 139589399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139591477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69795723 + 69795724.

It is an arithmetic number, because the mean of its divisors is an integer number (69795724).

Almost surely, 2^139591447 is an apocalyptic number.

139591447 is a deficient number, since it is larger than the sum of its proper divisors (1).

139591447 is an equidigital number, since it uses as much as digits as its factorization.

139591447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 139591447 is about 11814.8824369945. The cubic root of 139591447 is about 518.7438206648.

The spelling of 139591447 in words is "one hundred thirty-nine million, five hundred ninety-one thousand, four hundred forty-seven".