9999999951 has 16 divisors (see below), whose sum is σ = 13484260608. Its totient is φ = 6591340800.

The previous prime is 9999999943. The next prime is 9999999967. The reversal of 9999999951 is 1599999999.

It is not a de Polignac number, because 9999999951 - 2³ = 9999999943 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 (9999999151) 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, 283356 + ... + 316686.

It is an arithmetic number, because the mean of its divisors is an integer number (842766288).

Almost surely, 2^9999999951 is an apocalyptic number.

9999999951 is a deficient number, since it is larger than the sum of its proper divisors (3484260657).

9999999951 is a wasteful number, since it uses less digits than its factorization.

9999999951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34462.

The product of its digits is 215233605, while the sum is 78.

The square root of 9999999951 is about 99999.9997550000. Note that the first 3 decimals coincide. The cubic root of 9999999951 is about 2154.4346865130.

The spelling of 9999999951 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-one".