921601825 has 6 divisors (see below), whose sum is σ = 1142786294. Its totient is φ = 737281440.

The previous prime is 921601819. The next prime is 921601861. The reversal of 921601825 is 528106129.

It can be written as a sum of positive squares in 3 ways, for example, as 13905441 + 907696384 = 3729^2 + 30128^2 .

It is not a de Polignac number, because 921601825 - 2¹⁹ = 921077537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18432012 + ... + 18432061.

Almost surely, 2^921601825 is an apocalyptic number.

It is an amenable number.

921601825 is a deficient number, since it is larger than the sum of its proper divisors (221184469).

921601825 is a wasteful number, since it uses less digits than its factorization.

921601825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36864083 (or 36864078 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 921601825 is about 30357.8955957095. The cubic root of 921601825 is about 973.1529616535.

The spelling of 921601825 in words is "nine hundred twenty-one million, six hundred one thousand, eight hundred twenty-five".