999995431 has 2 divisors, whose sum is σ = 999995432. Its totient is φ = 999995430.

The previous prime is 999995419. The next prime is 999995531. The reversal of 999995431 is 134599999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999995431 is a prime.

It is a super-2 number, since 2×999995431² = 1999981724041751522, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999995531) 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, 499997715 + 499997716.

It is an arithmetic number, because the mean of its divisors is an integer number (499997716).

Almost surely, 2^999995431 is an apocalyptic number.

999995431 is a deficient number, since it is larger than the sum of its proper divisors (1).

999995431 is an equidigital number, since it uses as much as digits as its factorization.

999995431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3542940, while the sum is 58.

The square root of 999995431 is about 31622.7043593681. The cubic root of 999995431 is about 999.9984769977.

The spelling of 999995431 in words is "nine hundred ninety-nine million, nine hundred ninety-five thousand, four hundred thirty-one".