9999444431 has 16 divisors (see below), whose sum is σ = 10711430400. Its totient is φ = 9306249408.

The previous prime is 9999444407. The next prime is 9999444437. The reversal of 9999444431 is 1344449999.

It is a cyclic number.

It is not a de Polignac number, because 9999444431 - 2²² = 9995250127 is a prime.

It is a super-2 number, since 2×9999444431² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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 (9999444437) 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, 2770430 + ... + 2774036.

It is an arithmetic number, because the mean of its divisors is an integer number (669464400).

Almost surely, 2^9999444431 is an apocalyptic number.

9999444431 is a deficient number, since it is larger than the sum of its proper divisors (711985969).

9999444431 is a wasteful number, since it uses less digits than its factorization.

9999444431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6158.

The product of its digits is 5038848, while the sum is 56.

The square root of 9999444431 is about 99997.2221164168. Note that the first 3 decimals coincide. The cubic root of 9999444431 is about 2154.3947913888.

The spelling of 9999444431 in words is "nine billion, nine hundred ninety-nine million, four hundred forty-four thousand, four hundred thirty-one".