921794945 has 4 divisors (see below), whose sum is σ = 1106153940. Its totient is φ = 737435952.

The previous prime is 921794941. The next prime is 921794971. The reversal of 921794945 is 549497129.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 333829441 + 587965504 = 18271^2 + 24248^2 .

It is a cyclic number.

It is not a de Polignac number, because 921794945 - 2² = 921794941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 921794893 and 921794902.

It is not an unprimeable number, because it can be changed into a prime (921794941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92179490 + ... + 92179499.

It is an arithmetic number, because the mean of its divisors is an integer number (276538485).

Almost surely, 2^921794945 is an apocalyptic number.

It is an amenable number.

921794945 is a deficient number, since it is larger than the sum of its proper divisors (184358995).

921794945 is a wasteful number, since it uses less digits than its factorization.

921794945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184358994.

The product of its digits is 816480, while the sum is 50.

The square root of 921794945 is about 30361.0761502289. The cubic root of 921794945 is about 973.2209310553.

The spelling of 921794945 in words is "nine hundred twenty-one million, seven hundred ninety-four thousand, nine hundred forty-five".