491533351 has 2 divisors, whose sum is σ = 491533352. Its totient is φ = 491533350.

The previous prime is 491533333. The next prime is 491533397. The reversal of 491533351 is 153335194.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491533351 - 2⁵ = 491533319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491533331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245766675 + 245766676.

It is an arithmetic number, because the mean of its divisors is an integer number (245766676).

Almost surely, 2^491533351 is an apocalyptic number.

491533351 is a deficient number, since it is larger than the sum of its proper divisors (1).

491533351 is an equidigital number, since it uses as much as digits as its factorization.

491533351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 34.

The square root of 491533351 is about 22170.5514365340. The cubic root of 491533351 is about 789.1950092066.

The spelling of 491533351 in words is "four hundred ninety-one million, five hundred thirty-three thousand, three hundred fifty-one".