999975331 has 2 divisors, whose sum is σ = 999975332. Its totient is φ = 999975330.

The previous prime is 999975329. The next prime is 999975341. The reversal of 999975331 is 133579999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999975331 - 2¹ = 999975329 is a prime.

It is a super-2 number, since 2×999975331² = 1999901325217119122, which contains 22 as substring.

Together with 999975329, it forms a pair of twin primes.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (999975341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499987665 + 499987666.

It is an arithmetic number, because the mean of its divisors is an integer number (499987666).

Almost surely, 2^999975331 is an apocalyptic number.

999975331 is a deficient number, since it is larger than the sum of its proper divisors (1).

999975331 is an equidigital number, since it uses as much as digits as its factorization.

999975331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2066715, while the sum is 55.

The square root of 999975331 is about 31622.3865481402. The cubic root of 999975331 is about 999.9917769324.

The spelling of 999975331 in words is "nine hundred ninety-nine million, nine hundred seventy-five thousand, three hundred thirty-one".