491265331 has 2 divisors, whose sum is σ = 491265332. Its totient is φ = 491265330.

The previous prime is 491265319. The next prime is 491265407. The reversal of 491265331 is 133562194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491265331 - 2²¹ = 489168179 is a prime.

It is a super-2 number, since 2×491265331² = 482683250885079122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491265431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245632665 + 245632666.

It is an arithmetic number, because the mean of its divisors is an integer number (245632666).

Almost surely, 2^491265331 is an apocalyptic number.

491265331 is a deficient number, since it is larger than the sum of its proper divisors (1).

491265331 is an equidigital number, since it uses as much as digits as its factorization.

491265331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 491265331 is about 22164.5061077390. The cubic root of 491265331 is about 789.0515408112.

The spelling of 491265331 in words is "four hundred ninety-one million, two hundred sixty-five thousand, three hundred thirty-one".