999581461 has 2 divisors, whose sum is σ = 999581462. Its totient is φ = 999581460.

The previous prime is 999581459. The next prime is 999581467. The reversal of 999581461 is 164185999.

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., 506475025 + 493106436 = 22505^2 + 22206^2 .

It is a cyclic number.

It is not a de Polignac number, because 999581461 - 2¹ = 999581459 is a prime.

Together with 999581459, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 999581399 and 999581408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999581467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499790730 + 499790731.

It is an arithmetic number, because the mean of its divisors is an integer number (499790731).

Almost surely, 2^999581461 is an apocalyptic number.

It is an amenable number.

999581461 is a deficient number, since it is larger than the sum of its proper divisors (1).

999581461 is an equidigital number, since it uses as much as digits as its factorization.

999581461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 52.

The square root of 999581461 is about 31616.1582264512. The cubic root of 999581461 is about 999.8604675316.

The spelling of 999581461 in words is "nine hundred ninety-nine million, five hundred eighty-one thousand, four hundred sixty-one".