491694231 has 16 divisors (see below), whose sum is σ = 749758464. Its totient is φ = 280776864.

The previous prime is 491694223. The next prime is 491694239. The reversal of 491694231 is 132496194.

It is an interprime number because it is at equal distance from previous prime (491694223) and next prime (491694239).

It is not a de Polignac number, because 491694231 - 2³ = 491694223 is a prime.

It is a super-2 number, since 2×491694231² = 483526433597362722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491694231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491694239) 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, 27226 + ... + 41528.

It is an arithmetic number, because the mean of its divisors is an integer number (46859904).

Almost surely, 2^491694231 is an apocalyptic number.

491694231 is a deficient number, since it is larger than the sum of its proper divisors (258064233).

491694231 is a wasteful number, since it uses less digits than its factorization.

491694231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15950.

The product of its digits is 46656, while the sum is 39.

The square root of 491694231 is about 22174.1793760220. The cubic root of 491694231 is about 789.2811015971.

The spelling of 491694231 in words is "four hundred ninety-one million, six hundred ninety-four thousand, two hundred thirty-one".