491261 has 2 divisors, whose sum is σ = 491262. Its totient is φ = 491260.

The previous prime is 491251. The next prime is 491273. The reversal of 491261 is 162194.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256036 + 235225 = 506^2 + 485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491261 is a prime.

It is a Chen prime.

It is a congruent number.

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, 245630 + 245631.

It is an arithmetic number, because the mean of its divisors is an integer number (245631).

2⁴⁹¹²⁶¹ is an apocalyptic number.

It is an amenable number.

491261 is a deficient number, since it is larger than the sum of its proper divisors (1).

491261 is an equidigital number, since it uses as much as digits as its factorization.

491261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 491261 is about 700.9001355400. The cubic root of 491261 is about 78.9049222042.

The spelling of 491261 in words is "four hundred ninety-one thousand, two hundred sixty-one".