491512769 has 6 divisors (see below), whose sum is σ = 540257970. Its totient is φ = 446829680.

The previous prime is 491512753. The next prime is 491512771. The reversal of 491512769 is 967215194.

It can be written as a sum of positive squares in only one way, i.e., 269353744 + 222159025 = 16412^2 + 14905^2 .

It is not a de Polignac number, because 491512769 - 2⁴ = 491512753 is a prime.

It is a super-2 number, since 2×491512769² = 483169604180094722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491512669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2030924 + ... + 2031165.

It is an arithmetic number, because the mean of its divisors is an integer number (90042995).

Almost surely, 2^491512769 is an apocalyptic number.

It is an amenable number.

491512769 is a deficient number, since it is larger than the sum of its proper divisors (48745201).

491512769 is a wasteful number, since it uses less digits than its factorization.

491512769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062111 (or 4062100 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The square root of 491512769 is about 22170.0872573835. The cubic root of 491512769 is about 789.1839937191.

The spelling of 491512769 in words is "four hundred ninety-one million, five hundred twelve thousand, seven hundred sixty-nine".