9945107091 has 24 divisors (see below), whose sum is σ = 15155010000. Its totient is φ = 6267082752.

The previous prime is 9945107047. The next prime is 9945107093. The reversal of 9945107091 is 1907015499.

It is not a de Polignac number, because 9945107091 - 2⁶ = 9945107027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9945107093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12015 + ... + 141543.

It is an arithmetic number, because the mean of its divisors is an integer number (631458750).

Almost surely, 2^9945107091 is an apocalyptic number.

9945107091 is a deficient number, since it is larger than the sum of its proper divisors (5209902909).

9945107091 is a wasteful number, since it uses less digits than its factorization.

9945107091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130003 (or 130000 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 9945107091 is about 99725.1577637258. The cubic root of 9945107091 is about 2150.4853485850.

The spelling of 9945107091 in words is "nine billion, nine hundred forty-five million, one hundred seven thousand, ninety-one".