921441145 has 4 divisors (see below), whose sum is σ = 1105729380. Its totient is φ = 737152912.

The previous prime is 921441137. The next prime is 921441149. The reversal of 921441145 is 541144129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541144129 = 37 ⋅14625517.

It can be written as a sum of positive squares in 2 ways, for example, as 105596176 + 815844969 = 10276^2 + 28563^2 .

It is a cyclic number.

It is not a de Polignac number, because 921441145 - 2³ = 921441137 is a prime.

It is a super-2 number, since 2×921441145² = 1698107567397822050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (921441149) 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, 92144110 + ... + 92144119.

It is an arithmetic number, because the mean of its divisors is an integer number (276432345).

Almost surely, 2^921441145 is an apocalyptic number.

It is an amenable number.

921441145 is a deficient number, since it is larger than the sum of its proper divisors (184288235).

921441145 is a wasteful number, since it uses less digits than its factorization.

921441145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184288234.

The product of its digits is 5760, while the sum is 31.

The square root of 921441145 is about 30355.2490518526. The cubic root of 921441145 is about 973.0964024100.

The spelling of 921441145 in words is "nine hundred twenty-one million, four hundred forty-one thousand, one hundred forty-five".