999999108131407 has 4 divisors (see below), whose sum is σ = 1000002540729400. Its totient is φ = 999995675533416.

The previous prime is 999999108131399. The next prime is 999999108131447. The reversal of 999999108131407 is 704131801999999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 999999108131407 - 2³ = 999999108131399 is a prime.

It is the 31622763-rd Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999108131447) by changing a digit.

It is a nontrivial repunit in base 31622762.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1715861973 + ... + 1716444670.

It is an arithmetic number, because the mean of its divisors is an integer number (250000635182350).

Almost surely, 2^{999999108131407} is an apocalyptic number.

999999108131407 is a deficient number, since it is larger than the sum of its proper divisors (3432597993).

999999108131407 is a wasteful number, since it uses less digits than its factorization.

999999108131407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432597992.

The product of its (nonzero) digits is 357128352, while the sum is 79.

The spelling of 999999108131407 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, one hundred eight million, one hundred thirty-one thousand, four hundred seven".