921738549 has 4 divisors (see below), whose sum is σ = 1228984736. Its totient is φ = 614492364.

The previous prime is 921738527. The next prime is 921738551. The reversal of 921738549 is 945837129.

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 not a de Polignac number, because 921738549 - 2¹³ = 921730357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921738498 and 921738507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921738599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153623089 + ... + 153623094.

It is an arithmetic number, because the mean of its divisors is an integer number (307246184).

Almost surely, 2^921738549 is an apocalyptic number.

It is an amenable number.

921738549 is a deficient number, since it is larger than the sum of its proper divisors (307246187).

921738549 is a wasteful number, since it uses less digits than its factorization.

921738549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307246186.

The product of its digits is 544320, while the sum is 48.

The square root of 921738549 is about 30360.1473810652. The cubic root of 921738549 is about 973.2010832257.

The spelling of 921738549 in words is "nine hundred twenty-one million, seven hundred thirty-eight thousand, five hundred forty-nine".