139187249 has 2 divisors, whose sum is σ = 139187250. Its totient is φ = 139187248.

The previous prime is 139187203. The next prime is 139187261. The reversal of 139187249 is 942781931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136142224 + 3045025 = 11668^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 139187249 - 2¹² = 139183153 is a prime.

It is not a weakly prime, because it can be changed into another prime (139187149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69593624 + 69593625.

It is an arithmetic number, because the mean of its divisors is an integer number (69593625).

Almost surely, 2^139187249 is an apocalyptic number.

It is an amenable number.

139187249 is a deficient number, since it is larger than the sum of its proper divisors (1).

139187249 is an equidigital number, since it uses as much as digits as its factorization.

139187249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 139187249 is about 11797.7645763933. The cubic root of 139187249 is about 518.2426487985.

The spelling of 139187249 in words is "one hundred thirty-nine million, one hundred eighty-seven thousand, two hundred forty-nine".