139523149 has 2 divisors, whose sum is σ = 139523150. Its totient is φ = 139523148.

The previous prime is 139523081. The next prime is 139523159. The reversal of 139523149 is 941325931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90383049 + 49140100 = 9507^2 + 7010^2 .

It is a cyclic number.

It is not a de Polignac number, because 139523149 - 2¹¹ = 139521101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139523159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69761574 + 69761575.

It is an arithmetic number, because the mean of its divisors is an integer number (69761575).

Almost surely, 2^139523149 is an apocalyptic number.

It is an amenable number.

139523149 is a deficient number, since it is larger than the sum of its proper divisors (1).

139523149 is an equidigital number, since it uses as much as digits as its factorization.

139523149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 139523149 is about 11811.9917456795. The cubic root of 139523149 is about 518.6592048187.

The spelling of 139523149 in words is "one hundred thirty-nine million, five hundred twenty-three thousand, one hundred forty-nine".