491234251 has 2 divisors, whose sum is σ = 491234252. Its totient is φ = 491234250.

The previous prime is 491234239. The next prime is 491234267. The reversal of 491234251 is 152432194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491234251 - 2¹⁹ = 490709963 is a prime.

It is a super-2 number, since 2×491234251² = 482622178711062002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491234291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245617125 + 245617126.

It is an arithmetic number, because the mean of its divisors is an integer number (245617126).

Almost surely, 2^491234251 is an apocalyptic number.

491234251 is a deficient number, since it is larger than the sum of its proper divisors (1).

491234251 is an equidigital number, since it uses as much as digits as its factorization.

491234251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 491234251 is about 22163.8049756805. The cubic root of 491234251 is about 789.0349006255.

The spelling of 491234251 in words is "four hundred ninety-one million, two hundred thirty-four thousand, two hundred fifty-one".