921742145 has 16 divisors (see below), whose sum is σ = 1130865408. Its totient is φ = 720912000.

The previous prime is 921742139. The next prime is 921742163. The reversal of 921742145 is 541247129.

921742145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 921742145 - 2¹² = 921738049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305645 + ... + 308645.

It is an arithmetic number, because the mean of its divisors is an integer number (70679088).

Almost surely, 2^921742145 is an apocalyptic number.

It is an amenable number.

921742145 is a deficient number, since it is larger than the sum of its proper divisors (209123263).

921742145 is a wasteful number, since it uses less digits than its factorization.

921742145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360.

The product of its digits is 20160, while the sum is 35.

The square root of 921742145 is about 30360.2066033813. The cubic root of 921742145 is about 973.2023488148.

The spelling of 921742145 in words is "nine hundred twenty-one million, seven hundred forty-two thousand, one hundred forty-five".