139230649 has 2 divisors, whose sum is σ = 139230650. Its totient is φ = 139230648.

The previous prime is 139230643. The next prime is 139230673. The reversal of 139230649 is 946032931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70224400 + 69006249 = 8380^2 + 8307^2 .

It is an emirp because it is prime and its reverse (946032931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139230649 - 2⁵ = 139230617 is a prime.

It is a super-2 number, since 2×139230649² = 38770347241922402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139230643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69615324 + 69615325.

It is an arithmetic number, because the mean of its divisors is an integer number (69615325).

Almost surely, 2^139230649 is an apocalyptic number.

It is an amenable number.

139230649 is a deficient number, since it is larger than the sum of its proper divisors (1).

139230649 is an equidigital number, since it uses as much as digits as its factorization.

139230649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 139230649 is about 11799.6037645338. The cubic root of 139230649 is about 518.2965076441.

It can be divided in two parts, 1392 and 30649, that added together give a square (32041 = 179²).

The spelling of 139230649 in words is "one hundred thirty-nine million, two hundred thirty thousand, six hundred forty-nine".