9945591 has 8 divisors (see below), whose sum is σ = 13837440. Its totient is φ = 6342072.

The previous prime is 9945587. The next prime is 9945619. The reversal of 9945591 is 1955499.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9945591 - 2² = 9945587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9945511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72001 + ... + 72138.

It is an arithmetic number, because the mean of its divisors is an integer number (1729680).

Almost surely, 2^9945591 is an apocalyptic number.

9945591 is a deficient number, since it is larger than the sum of its proper divisors (3891849).

9945591 is a wasteful number, since it uses less digits than its factorization.

9945591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144165.

The product of its digits is 72900, while the sum is 42.

The square root of 9945591 is about 3153.6631081966. The cubic root of 9945591 is about 215.0520227457.

The spelling of 9945591 in words is "nine million, nine hundred forty-five thousand, five hundred ninety-one".