138552649 has 4 divisors (see below), whose sum is σ = 140306560. Its totient is φ = 136798740.

The previous prime is 138552641. The next prime is 138552707. The reversal of 138552649 is 946255831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138552649 - 2³ = 138552641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138552641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876837 + ... + 876994.

It is an arithmetic number, because the mean of its divisors is an integer number (35076640).

Almost surely, 2^138552649 is an apocalyptic number.

It is an amenable number.

138552649 is a deficient number, since it is larger than the sum of its proper divisors (1753911).

138552649 is an equidigital number, since it uses as much as digits as its factorization.

138552649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753910.

The product of its digits is 259200, while the sum is 43.

The square root of 138552649 is about 11770.8389250724. The cubic root of 138552649 is about 517.4538364229.

The spelling of 138552649 in words is "one hundred thirty-eight million, five hundred fifty-two thousand, six hundred forty-nine".