491129 has 2 divisors, whose sum is σ = 491130. Its totient is φ = 491128.

The previous prime is 491083. The next prime is 491137. The reversal of 491129 is 921194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 21904 = 685^2 + 148^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491129 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 491098 and 491107.

It is not a weakly prime, because it can be changed into another prime (491149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245564 + 245565.

It is an arithmetic number, because the mean of its divisors is an integer number (245565).

2⁴⁹¹¹²⁹ is an apocalyptic number.

It is an amenable number.

491129 is a deficient number, since it is larger than the sum of its proper divisors (1).

491129 is an equidigital number, since it uses as much as digits as its factorization.

491129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 491129 is about 700.8059645865. The cubic root of 491129 is about 78.8978544183.

The spelling of 491129 in words is "four hundred ninety-one thousand, one hundred twenty-nine".