139261091 has 2 divisors, whose sum is σ = 139261092. Its totient is φ = 139261090.

The previous prime is 139261079. The next prime is 139261097. The reversal of 139261091 is 190162931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139261091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139261097) 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, 69630545 + 69630546.

It is an arithmetic number, because the mean of its divisors is an integer number (69630546).

Almost surely, 2^139261091 is an apocalyptic number.

139261091 is a deficient number, since it is larger than the sum of its proper divisors (1).

139261091 is an equidigital number, since it uses as much as digits as its factorization.

139261091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 139261091 is about 11800.8936526011. The cubic root of 139261091 is about 518.3342790989.

The spelling of 139261091 in words is "one hundred thirty-nine million, two hundred sixty-one thousand, ninety-one".