991301 has 4 divisors (see below), whose sum is σ = 993504. Its totient is φ = 989100.

The previous prime is 991273. The next prime is 991313. The reversal of 991301 is 103199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 103199 = 31 ⋅3329.

It is a cyclic number.

It is not a de Polignac number, because 991301 - 2¹⁰ = 990277 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991301.

It is not an unprimeable number, because it can be changed into a prime (991381) 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, 155 + ... + 1416.

It is an arithmetic number, because the mean of its divisors is an integer number (248376).

2⁹⁹¹³⁰¹ is an apocalyptic number.

It is an amenable number.

991301 is a deficient number, since it is larger than the sum of its proper divisors (2203).

991301 is a wasteful number, since it uses less digits than its factorization.

991301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 991301 is about 995.6409995576. The cubic root of 991301 is about 99.7091884395.

The spelling of 991301 in words is "nine hundred ninety-one thousand, three hundred one".