999912461 has 2 divisors, whose sum is σ = 999912462. Its totient is φ = 999912460.

The previous prime is 999912413. The next prime is 999912499. The reversal of 999912461 is 164219999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666156100 + 333756361 = 25810^2 + 18269^2 .

It is an emirp because it is prime and its reverse (164219999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999912461 - 2¹⁴ = 999896077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999962461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499956230 + 499956231.

It is an arithmetic number, because the mean of its divisors is an integer number (499956231).

Almost surely, 2^999912461 is an apocalyptic number.

It is an amenable number.

999912461 is a deficient number, since it is larger than the sum of its proper divisors (1).

999912461 is an equidigital number, since it uses as much as digits as its factorization.

999912461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 50.

The square root of 999912461 is about 31621.3924582710. The cubic root of 999912461 is about 999.9708194818.

The spelling of 999912461 in words is "nine hundred ninety-nine million, nine hundred twelve thousand, four hundred sixty-one".