548909138 has 4 divisors (see below), whose sum is σ = 823363710. Its totient is φ = 274454568.

The previous prime is 548909087. The next prime is 548909161. The reversal of 548909138 is 831909845.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 430687009 + 118222129 = 20753^2 + 10873^2 .

It is a junction number, because it is equal to n+sod(n) for n = 548909092 and 548909101.

It is an unprimeable number.

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, 137227283 + ... + 137227286.

Almost surely, 2^548909138 is an apocalyptic number.

548909138 is a deficient number, since it is larger than the sum of its proper divisors (274454572).

548909138 is a wasteful number, since it uses less digits than its factorization.

548909138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274454571.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 548909138 is about 23428.8099996564. The cubic root of 548909138 is about 818.7792354574.

The spelling of 548909138 in words is "five hundred forty-eight million, nine hundred nine thousand, one hundred thirty-eight".