491251 has 2 divisors, whose sum is σ = 491252. Its totient is φ = 491250.

The previous prime is 491219. The next prime is 491261. The reversal of 491251 is 152194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491251 - 2⁵ = 491219 is a prime.

It is not a weakly prime, because it can be changed into another prime (491201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245625 + 245626.

It is an arithmetic number, because the mean of its divisors is an integer number (245626).

2⁴⁹¹²⁵¹ is an apocalyptic number.

491251 is a deficient number, since it is larger than the sum of its proper divisors (1).

491251 is an equidigital number, since it uses as much as digits as its factorization.

491251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 22.

The square root of 491251 is about 700.8930018198. The cubic root of 491251 is about 78.9043868102.

The spelling of 491251 in words is "four hundred ninety-one thousand, two hundred fifty-one".