9999901231 has 4 divisors (see below), whose sum is σ = 10006219872. Its totient is φ = 9993582592.

The previous prime is 9999901207. The next prime is 9999901253. The reversal of 9999901231 is 1321099999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321099999 = 31 ⋅42616129.

It is a cyclic number.

It is not a de Polignac number, because 9999901231 - 2¹³ = 9999893039 is a prime.

It is a super-2 number, since 2×9999901231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999901201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3156946 + ... + 3160111.

It is an arithmetic number, because the mean of its divisors is an integer number (2501554968).

Almost surely, 2^9999901231 is an apocalyptic number.

9999901231 is a deficient number, since it is larger than the sum of its proper divisors (6318641).

9999901231 is a wasteful number, since it uses less digits than its factorization.

9999901231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6318640.

The product of its (nonzero) digits is 354294, while the sum is 52.

The square root of 9999901231 is about 99999.5061537806. The cubic root of 9999901231 is about 2154.4275969632.

The spelling of 9999901231 in words is "nine billion, nine hundred ninety-nine million, nine hundred one thousand, two hundred thirty-one".