999447331 has 2 divisors, whose sum is σ = 999447332. Its totient is φ = 999447330.

The previous prime is 999447299. The next prime is 999447353. The reversal of 999447331 is 133744999.

It is a strong prime.

It is an emirp because it is prime and its reverse (133744999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999447331 - 2⁵ = 999447299 is a prime.

It is a super-2 number, since 2×999447331² = 1997789934886047122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999447131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499723665 + 499723666.

It is an arithmetic number, because the mean of its divisors is an integer number (499723666).

Almost surely, 2^999447331 is an apocalyptic number.

999447331 is a deficient number, since it is larger than the sum of its proper divisors (1).

999447331 is an equidigital number, since it uses as much as digits as its factorization.

999447331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 49.

The square root of 999447331 is about 31614.0369298196. The cubic root of 999447331 is about 999.8157430515.

The spelling of 999447331 in words is "nine hundred ninety-nine million, four hundred forty-seven thousand, three hundred thirty-one".