491027729 has 2 divisors, whose sum is σ = 491027730. Its totient is φ = 491027728.

The previous prime is 491027723. The next prime is 491027737. The reversal of 491027729 is 927720194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273406225 + 217621504 = 16535^2 + 14752^2 .

It is a cyclic number.

It is not a de Polignac number, because 491027729 - 2²⁰ = 489979153 is a prime.

It is a super-2 number, since 2×491027729² = 482216461293794882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (491027723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245513864 + 245513865.

It is an arithmetic number, because the mean of its divisors is an integer number (245513865).

Almost surely, 2^491027729 is an apocalyptic number.

It is an amenable number.

491027729 is a deficient number, since it is larger than the sum of its proper divisors (1).

491027729 is an equidigital number, since it uses as much as digits as its factorization.

491027729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 491027729 is about 22159.1454934526. The cubic root of 491027729 is about 788.9243112229.

The spelling of 491027729 in words is "four hundred ninety-one million, twenty-seven thousand, seven hundred twenty-nine".