999951 has 16 divisors (see below), whose sum is σ = 1434240. Its totient is φ = 617760.

The previous prime is 999931. The next prime is 999953. The reversal of 999951 is 159999.

999951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999951 - 2¹⁰ = 998927 is a prime.

999951 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999951.

It is not an unprimeable number, because it can be changed into a prime (999953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2856 + ... + 3186.

It is an arithmetic number, because the mean of its divisors is an integer number (89640).

2⁹⁹⁹⁹⁵¹ is an apocalyptic number.

999951 is a deficient number, since it is larger than the sum of its proper divisors (434289).

999951 is a wasteful number, since it uses less digits than its factorization.

999951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406.

The product of its digits is 32805, while the sum is 42.

The square root of 999951 is about 999.9754996999. The cubic root of 999951 is about 99.9983666400.

The spelling of 999951 in words is "nine hundred ninety-nine thousand, nine hundred fifty-one".