919391 has 16 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 767520.

The previous prime is 919381. The next prime is 919393. The reversal of 919391 is 193919.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-919391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11036 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2⁹¹⁹³⁹¹ is an apocalyptic number.

919391 is a deficient number, since it is larger than the sum of its proper divisors (169249).

919391 is a wasteful number, since it uses less digits than its factorization.

919391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166.

The product of its digits is 2187, while the sum is 32.

The square root of 919391 is about 958.8487889130. The cubic root of 919391 is about 97.2374175010.

The spelling of 919391 in words is "nine hundred nineteen thousand, three hundred ninety-one".