999925321 has 2 divisors, whose sum is σ = 999925322. Its totient is φ = 999925320.

The previous prime is 999925313. The next prime is 999925337. The reversal of 999925321 is 123529999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991305225 + 8620096 = 31485^2 + 2936^2 .

It is a cyclic number.

It is not a de Polignac number, because 999925321 - 2³ = 999925313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999925921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499962660 + 499962661.

It is an arithmetic number, because the mean of its divisors is an integer number (499962661).

Almost surely, 2^999925321 is an apocalyptic number.

It is an amenable number.

999925321 is a deficient number, since it is larger than the sum of its proper divisors (1).

999925321 is an equidigital number, since it uses as much as digits as its factorization.

999925321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 49.

The square root of 999925321 is about 31621.5958009712. The cubic root of 999925321 is about 999.9751063803.

The spelling of 999925321 in words is "nine hundred ninety-nine million, nine hundred twenty-five thousand, three hundred twenty-one".