491785351 has 2 divisors, whose sum is σ = 491785352. Its totient is φ = 491785350.

The previous prime is 491785339. The next prime is 491785369. The reversal of 491785351 is 153587194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491785351 - 2⁵ = 491785319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491785298 and 491785307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491785321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245892675 + 245892676.

It is an arithmetic number, because the mean of its divisors is an integer number (245892676).

Almost surely, 2^491785351 is an apocalyptic number.

491785351 is a deficient number, since it is larger than the sum of its proper divisors (1).

491785351 is an equidigital number, since it uses as much as digits as its factorization.

491785351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 491785351 is about 22176.2339228283. The cubic root of 491785351 is about 789.3298546955.

The spelling of 491785351 in words is "four hundred ninety-one million, seven hundred eighty-five thousand, three hundred fifty-one".