99999951 has 8 divisors (see below), whose sum is σ = 133386624. Its totient is φ = 66639960.

The previous prime is 99999941. The next prime is 99999959. The reversal of 99999951 is 15999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99999951 - 2⁹ = 99999439 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999959) 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 in 7 ways as a sum of consecutive naturals, for example, 4990 + ... + 14996.

It is an arithmetic number, because the mean of its divisors is an integer number (16673328).

Almost surely, 2^99999951 is an apocalyptic number.

99999951 is a deficient number, since it is larger than the sum of its proper divisors (33386673).

99999951 is a wasteful number, since it uses less digits than its factorization.

99999951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13341.

The product of its digits is 2657205, while the sum is 60.

The square root of 99999951 is about 9999.9975499997. The cubic root of 99999951 is about 464.1588075486.

The spelling of 99999951 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-one".