139255091 has 2 divisors, whose sum is σ = 139255092. Its totient is φ = 139255090.

The previous prime is 139255057. The next prime is 139255099. The reversal of 139255091 is 190552931.

139255091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (190552931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139255091 - 2¹⁸ = 138992947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139255099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69627545 + 69627546.

It is an arithmetic number, because the mean of its divisors is an integer number (69627546).

Almost surely, 2^139255091 is an apocalyptic number.

139255091 is a deficient number, since it is larger than the sum of its proper divisors (1).

139255091 is an equidigital number, since it uses as much as digits as its factorization.

139255091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 139255091 is about 11800.6394318274. The cubic root of 139255091 is about 518.3268349274.

The spelling of 139255091 in words is "one hundred thirty-nine million, two hundred fifty-five thousand, ninety-one".