491213 has 2 divisors, whose sum is σ = 491214. Its totient is φ = 491212.

The previous prime is 491201. The next prime is 491219. The reversal of 491213 is 312194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386884 + 104329 = 622^2 + 323^2 .

It is a cyclic number.

It is not a de Polignac number, because 491213 - 2⁶ = 491149 is a prime.

It is a super-2 number, since 2×491213² = 482580422738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245606 + 245607.

It is an arithmetic number, because the mean of its divisors is an integer number (245607).

2⁴⁹¹²¹³ is an apocalyptic number.

It is an amenable number.

491213 is a deficient number, since it is larger than the sum of its proper divisors (1).

491213 is an equidigital number, since it uses as much as digits as its factorization.

491213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 491213 is about 700.8658930209. The cubic root of 491213 is about 78.9023522468.

The spelling of 491213 in words is "four hundred ninety-one thousand, two hundred thirteen".