921145 has 8 divisors (see below), whose sum is σ = 1170504. Its totient is φ = 693504.

The previous prime is 921143. The next prime is 921149. The reversal of 921145 is 541129.

921145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 89401 + 831744 = 299^2 + 912^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 921145 - 2¹ = 921143 is a prime.

It is a super-2 number, since 2×921145² = 1697016222050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5334 + ... + 5503.

It is an arithmetic number, because the mean of its divisors is an integer number (146313).

2⁹²¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

921145 is a deficient number, since it is larger than the sum of its proper divisors (249359).

921145 is a wasteful number, since it uses less digits than its factorization.

921145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10859.

The product of its digits is 360, while the sum is 22.

The square root of 921145 is about 959.7629915766. The cubic root of 921145 is about 97.2992142355.

The spelling of 921145 in words is "nine hundred twenty-one thousand, one hundred forty-five".