921741749 has 4 divisors (see below), whose sum is σ = 921816300. Its totient is φ = 921667200.

The previous prime is 921741707. The next prime is 921741803. The reversal of 921741749 is 947147129.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 93741124 + 828000625 = 9682^2 + 28775^2 .

It is a cyclic number.

It is not a de Polignac number, because 921741749 - 2¹⁶ = 921676213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921741349) 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, 13802 + ... + 45099.

It is an arithmetic number, because the mean of its divisors is an integer number (230454075).

Almost surely, 2^921741749 is an apocalyptic number.

It is an amenable number.

921741749 is a deficient number, since it is larger than the sum of its proper divisors (74551).

921741749 is a wasteful number, since it uses less digits than its factorization.

921741749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74550.

The product of its digits is 127008, while the sum is 44.

The square root of 921741749 is about 30360.2000816859. The cubic root of 921741749 is about 973.2022094453.

The spelling of 921741749 in words is "nine hundred twenty-one million, seven hundred forty-one thousand, seven hundred forty-nine".