999990461 has 2 divisors, whose sum is σ = 999990462. Its totient is φ = 999990460.

The previous prime is 999990421. The next prime is 999990479. The reversal of 999990461 is 164099999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 717918436 + 282072025 = 26794^2 + 16795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999990461 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 999990397 and 999990406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999990421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499995230 + 499995231.

It is an arithmetic number, because the mean of its divisors is an integer number (499995231).

Almost surely, 2^999990461 is an apocalyptic number.

It is an amenable number.

999990461 is a deficient number, since it is larger than the sum of its proper divisors (1).

999990461 is an equidigital number, since it uses as much as digits as its factorization.

999990461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The square root of 999990461 is about 31622.6257764911. The cubic root of 999990461 is about 999.9968203232.

The spelling of 999990461 in words is "nine hundred ninety-nine million, nine hundred ninety thousand, four hundred sixty-one".