991000901 has 8 divisors (see below), whose sum is σ = 1115966208. Its totient is φ = 871848000.

The previous prime is 991000891. The next prime is 991000909. The reversal of 991000901 is 109000199.

991000901 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 991000901 - 2¹⁴ = 990984517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991000909) 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, 1452740 + ... + 1453421.

It is an arithmetic number, because the mean of its divisors is an integer number (139495776).

Almost surely, 2^991000901 is an apocalyptic number.

It is an amenable number.

991000901 is a deficient number, since it is larger than the sum of its proper divisors (124965307).

991000901 is a wasteful number, since it uses less digits than its factorization.

991000901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906203.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 991000901 is about 31480.1667879953. The cubic root of 991000901 is about 996.9912568771.

The spelling of 991000901 in words is "nine hundred ninety-one million, nine hundred one", and thus it is an aban number.