9145991 has 8 divisors (see below), whose sum is σ = 9521280. Its totient is φ = 8774752.

The previous prime is 9145987. The next prime is 9146009. The reversal of 9145991 is 1995419.

9145991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 9145991 - 2² = 9145987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9145901) 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, 4106 + ... + 5928.

It is an arithmetic number, because the mean of its divisors is an integer number (1190160).

Almost surely, 2^9145991 is an apocalyptic number.

9145991 is a deficient number, since it is larger than the sum of its proper divisors (375289).

9145991 is a wasteful number, since it uses less digits than its factorization.

9145991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025.

The product of its digits is 14580, while the sum is 38.

The square root of 9145991 is about 3024.2339525903. The cubic root of 9145991 is about 209.1270718285.

The spelling of 9145991 in words is "nine million, one hundred forty-five thousand, nine hundred ninety-one".