999995531 has 2 divisors, whose sum is σ = 999995532. Its totient is φ = 999995530.

The previous prime is 999995431. The next prime is 999995561. The reversal of 999995531 is 135599999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999995531 - 2¹⁰ = 999994507 is a prime.

It is a super-2 number, since 2×999995531² = 1999982124039943922, which contains 22 as substring.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (999995561) 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, 499997765 + 499997766.

It is an arithmetic number, because the mean of its divisors is an integer number (499997766).

Almost surely, 2^999995531 is an apocalyptic number.

999995531 is a deficient number, since it is larger than the sum of its proper divisors (1).

999995531 is an equidigital number, since it uses as much as digits as its factorization.

999995531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4428675, while the sum is 59.

The square root of 999995531 is about 31622.7059405105. The cubic root of 999995531 is about 999.9985103311.

The spelling of 999995531 in words is "nine hundred ninety-nine million, nine hundred ninety-five thousand, five hundred thirty-one".