999424561 has 2 divisors, whose sum is σ = 999424562. Its totient is φ = 999424560.

The previous prime is 999424513. The next prime is 999424571. The reversal of 999424561 is 165424999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 614048400 + 385376161 = 24780^2 + 19631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999424561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999424571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499712280 + 499712281.

It is an arithmetic number, because the mean of its divisors is an integer number (499712281).

Almost surely, 2^999424561 is an apocalyptic number.

It is an amenable number.

999424561 is a deficient number, since it is larger than the sum of its proper divisors (1).

999424561 is an equidigital number, since it uses as much as digits as its factorization.

999424561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 49.

The square root of 999424561 is about 31613.6768029282. The cubic root of 999424561 is about 999.8081501960.

The spelling of 999424561 in words is "nine hundred ninety-nine million, four hundred twenty-four thousand, five hundred sixty-one".